The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Hi everyone,
It's been grant deadlines and back to teaching this week, so Matt's arXiv is a
Friday night special. We have 23 new preprints and 12 replacements:
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arXiv:0802.2101
Date: Thu, 14 Feb 2008 22:23:04 GMT (150kb,D)
Title: Stability of Superflow for Ultracold Fermions in Optical Lattices
Authors: A.A. Burkov, Arun Paramekanti
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 4+ pages, 2 figures
\\
Motivated by recent observations of superfluidity of ultracold fermions in
optical lattices, we investigate the stability of superfluid flow of paired
fermions in the lowest band of a strong optical lattice. For fillings close to
one fermion per site, we show that superflow breaks down via a dynamical
instability leading to a transient density wave. At lower fillings, there is a
distinct dynamical instability, where the superfluid stiffness becomes
negative; this evolves, with increasing pairing interaction, from the fermion
pair breaking instability to the well-known dynamical instability of lattice
bosons. Our most interesting finding is the existence of a transition, over a
range of fillings close to one fermion per site, from the fermion depairing
instability to the density wave instability as the strength of the pairing
interaction is increased. By sharp contrast, the ground state in this regime
evolves smoothly with increasing interaction analogous to the BCS-BEC
crossover.
\\ ( http://arxiv.org/abs/0802.2101 , 150kb)
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arXiv:0802.2222
Date: Fri, 15 Feb 2008 15:15:30 GMT (33kb)
Title: Nonlinear Schr\"odinger equation for a superfluid Fermi gas from BCS to
Bose crossover
Authors: S. K. Adhikari
Categories: cond-mat.other
Comments: 4 pages, 5 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We introduce a quasi-analytic nonlinear Schr\"odinger equation with beyond
mean-field corrections to describe the dynamics of a zero-temperature dilute
superfluid Fermi gas in the crossover from the weak-coupling
Bardeen-Cooper-Schrieffer (BCS) regime, where $k_F|a| \ll 1$ with $a$ the
s-wave scattering length and $k_F$ the Fermi momentum, through the unitarity
limit, $k_Fa \to \pm \infty$, to the Bose regime where $k_Fa >0$. The energy of
our model is parametrized using the known asymptotic behavior in the BCS, Bose,
and the unitarity limits and is in excellent agreement with accurate Green
function Monte Carlo calculations. The model generates good results for
frequencies of collective breathing oscillation of a trapped Fermi superfluid.
\\ ( http://arxiv.org/abs/0802.2222 , 33kb)
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arXiv:0802.2231
Date: Fri, 15 Feb 2008 15:50:10 GMT (476kb)
Title: Josephson oscillation of a superfluid Fermi gas
Authors: S. K. Adhikari
Categories: cond-mat.other
Comments: 7 pages, 10 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Using the complete numerical solution of a time-dependent three-dimensional
mean-field model we study the Josephson oscillation of a superfluid Fermi gas
(SFG) at zero temperature formed in a combined axially-symmetric harmonic plus
one-dimensional periodic optical-lattice (OL) potentials after displacing the
harmonic trap along the axial OL axis. We study the dependence of Josephson
frequency on the strength of the OL potential. The Josephson frequency
decreases with increasing strength as found in the experiment of Cataliotti et
al. [Science 293 (2001) 843] for a Bose-Einstein condensate and of the
experiment of Pezze et al. [Phys. Rev. Lett. 93 (2004) 120401] for an ideal
Fermi gas. We demonstrate a breakdown of Josephson oscillation in the SFG for a
large displacement of the harmonic trap. These features of Josephson
oscillation of a SFG can be tested experimentally.
\\ ( http://arxiv.org/abs/0802.2231 , 476kb)
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arXiv:0802.2136
Date: Fri, 15 Feb 2008 03:39:43 GMT (298kb)
Title: Large Cross-phase Modulation Based on Double EIT in a Four-level Tripod
Atomic System
Authors: Shujing Li, Xudong Yang, Xuemin Cao, Chunhong Zhang, Changde Xie, Hai
Wang
Categories: quant-ph
Comments: 13 pages, 4 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We report the experimental observations on the simultaneous EIT effects for
probe and trigger fields (double EIT) as well as the large cross-phase
modulation (XPM) between the two fields in a four-level tripod EIT system of
the D1 line of 87Rb atoms. The XPM coefficients (larger than 2*10-5cm2/W) and
the accompanying transmissions (higher than 60%) are measured at slightly
detuning of the probe field from the exact EIT resonance condition. The
presented system can be applied in the recently proposed quantum information
processing with weak cross-Kerr nonlinearities.
\\ ( http://arxiv.org/abs/0802.2136 , 298kb)
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arXiv:0802.2149
Date: Fri, 15 Feb 2008 08:34:51 GMT (66kb)
Title: Goos-H\"{a}nchen-Like Shifts in Atom Optics
Authors: Jianhua Huang, Zhenglu Duan, Hongyuan Ling, and Weiping Zhang
Categories: quant-ph
Comments: 7 pages, 4 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We consider the propagation of a matter wavepacket of two-level atoms through
a square potential created by a super-Gaussian laser beam. We explore the
matter wave analog of Goos-H\"{a}nchen shift within the framework of atom
optics where the roles of atom and light is exchanged with respect to
conventional optics. Using a vector theory, where atoms are treated as
particles possessing two internal spin components, we show that not only large
negative but also large positive Goos-H\"{a}nchen shifts can occur in the
reflected atomic beam.
\\ ( http://arxiv.org/abs/0802.2149 , 66kb)
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arXiv:0802.2444
Date: Mon, 18 Feb 2008 12:57:34 GMT (141kb)
Title: Quantum and quasi-classical types of superfluid turbulence
Authors: P. M. Walmsley and A. I. Golov
Categories: cond-mat.other
Comments: 4 pages, 5 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
By colliding charged quantized vortex rings of radius R=0.6 microns in
superfluid 4He in the zero-temperature limit (T<0.5 K), we have succeeded in
generating tangles of quantized vortex line with negligible large-scale flow.
After such a tangle is created near one side of a cubic cell of side 4.5 cm, it
takes about 10 s for the turbulence to spread into all the volume and become
homogeneous. For this quantum regime of superfluid turbulence, the vortex line
length L was found to decay at late time t as L proportional to 1/t within at
least two orders of magnitude; the prefactor being independent of the initial
value of L. The corresponding effective kinematic viscosity is 0.1 circulation
quanta which is 30 times greater than that for quasi-classical turbulence
generated by large-scale flow at T=0. At T>0.7 K, when the density of thermal
excitations becomes substantial, a jet of ions generates quasi-classical
tangles identical to those produced by mechanical means.
\\ ( http://arxiv.org/abs/0802.2444 , 141kb)
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arXiv:0802.2455
Date: Mon, 18 Feb 2008 11:09:46 GMT (621kb)
Title: Pacifying the Fermi-liquid: battling the devious fermion signs
Authors: J. Zaanen, F. Kr\"uger, J.-H. She, D. Sadri, S. I. Mukhin
Categories: cond-mat.other
Comments: 28 pages, 5 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
The fermion sign problem is studied in the path integral formalism. The
standard picture of Fermi liquids is first critically analyzed, pointing out
some of its rather peculiar properties. The insightful work of Ceperley in
constructing fermionic path integrals in terms of constrained world-lines is
then reviewed. In this representation, the minus signs associated with
Fermi-Dirac statistics are self consistently translated into a geometrical
constraint structure (the {\em nodal hypersurface}) acting on an effective
bosonic dynamics. As an illustrative example we use this formalism to study
1+1-dimensional systems, where statistics are irrelevant, and hence the sign
problem can be circumvented. In this low-dimensional example, the structure of
the nodal constraints leads to a lucid picture of the entropic interaction
essential to one-dimensional physics. Working with the path integral in
momentum space, we then show that the Fermi gas can be understood by analogy to
a Mott insulator in a harmonic trap. Going back to real space, we discuss the
topological properties of the nodal cells, and suggest a new holographic
conjecture relating Fermi liquids in higher dimensions to soft-core bosons in
one dimension. We also discuss some possible connections between mixed
Bose/Fermi systems and supersymmetry.
\\ ( http://arxiv.org/abs/0802.2455 , 621kb)
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arXiv:0802.2498
Date: Mon, 18 Feb 2008 15:34:29 GMT (36kb)
Title: Ultracold bosons in disordered superlattices: Mott-insulators induced by
tunneling
Authors: D. Muth, A. Mering and M. Fleischhauer
Categories: cond-mat.other cond-mat.dis-nn
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We analyse the phase diagram of ultra-cold bosons in a one-dimensional
superlattice potential with disorder using the time evolving block decimation
algorithm for infinite sized systems (iTEBD). For degenerate potential energies
within the unit cell of the superlattice loophole-shaped insulating phases with
non-integer filling emerge with a particle-hole gap proportional to the boson
hopping. Adding a small amount of disorder destroys this gap. For not too large
disorder the loophole Mott regions detach from the axis of vanishing hopping
giving rise to insulating islands. Thus the system shows a transition from a
compressible Bose-glass to a Mott-insulating phase with increasing hopping
amplitude. We present a straight forward effective model for the dynamics
within a unit cell which provides a simple explanation for the emergence of
Mott-insulating islands. In particular it gives rather accurate predictions for
the inner critical point of the Bose-glass to Mott-insulator transition.
\\ ( http://arxiv.org/abs/0802.2498 , 36kb)
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arXiv:0802.2548
Date: Mon, 18 Feb 2008 21:01:50 GMT (223kb)
Title: Preemptive vortex-loop proliferation in multicomponent interacting
Bose--Einstein condensates
Authors: E. K. Dahl, E. Babaev, S. Kragset, and A. Sudbo
Categories: cond-mat.stat-mech
Comments: 12 pages, 10 figures. Submitted to Physical Review B
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We use analytical arguments and large-scale Monte Carlo calculations to
investigate the nature of the phase transitions between distinct complex
superfluid phases in a two-component Bose--Einstein condensate when a
non-dissipative drag between the two components is being varied. We focus on
understanding the role of topological defects in various phase transitions and
develop vortex-matter arguments allowing an analytical description of the phase
diagram. We find the behavior of fluctuation induced vortex matter to be much
more complex and substantially different from that of single-component
superfluids. We propose and investigate numerically a novel drag-induced
``preemptive vortex loop proliferation'' transition. Such a transition may be a
quite generic feature in many multicomponent systems where symmetry is restored
by a gas of several kinds of competing vortex loops.
\\ ( http://arxiv.org/abs/0802.2548 , 223kb)
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arXiv:0802.2591
Date: Tue, 19 Feb 2008 07:38:49 GMT (382kb)
Title: Studying a dual-species BEC with tunable interactions
Authors: S. B. Papp, J. M. Pino, and C. E. Wieman
Categories: cond-mat.other
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We report on the observation of controllable spatial separation in a
dual-species Bose-Einstein condensate (BEC) with $^{85}$Rb and $^{87}$Rb.
Interparticle interactions between the different components can change the
miscibility of the two quantum fluids. In our experiments, we clearly observe
the immiscible nature of the two simultaneously Bose-condensed species via
their spatial separation. Furthermore the $^{85}$Rb Feshbach resonance near 155
G is used to change them between miscible and immiscible by tuning the
$^{85}$Rb scattering length. Our apparatus is also able to create $^{85}$Rb
condensates with up to $8\times104$ atoms which represents a significant
improvement over previous work.
\\ ( http://arxiv.org/abs/0802.2591 , 382kb)
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arXiv:0802.2600
Date: Tue, 19 Feb 2008 07:20:05 GMT (96kb)
Title: Anomalous Monopole In an Interacting Boson System
Authors: Biao Wu, Qi Zhang and Jie Liu
Categories: cond-mat.other
Comments: 4 pages, 3 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Anomalous monopole of disk shape is found to exist in the semiclassical
theory of a two-mode interacting boson system. The quantum origin of this
anomaly is the collapsing or bundling of field lines of Berry curvature caused
by the interaction between bosons in the semiclassical limit. The significance
of this anomalous monopole is twofold: (1) it signals the failure of the von
Neumann-Wigner theorem in the semiclassical limit; (2) it indicates a breakdown
of the correspondence principle between quantum and classical dynamics.
\\ ( http://arxiv.org/abs/0802.2600 , 96kb)
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arXiv:0802.2601
Date: Tue, 19 Feb 2008 07:31:16 GMT (832kb)
Title: A quasi-monomode guided atom-laser from an all-optical Bose-Einstein
condensate
Authors: A. Couvert (LKB - Lhomond), M. Jeppesen (LKB - Lhomond), T. Kawalec
(LKB - Lhomond), G. Reinaudi (LKB - Lhomond), R. Mathevet (LCAR), David
Guery-Odelin (LKB - Lhomond, LCAR)
Categories: cond-mat.other
Comments: 4 pages, 4 figures
Proxy: ccsd hal-00257245
\\
We report the achievement of an optically guided and quasi-monomode atom
laser, in all spin projection states ($m_F =$ $-1$, $0$ and $+1$) of $F=1$ in
Rubidium 87. The atom laser source is a Bose-Einstein condensate (BEC) in a
crossed dipole trap, purified to any one spin projection state by a
spin-distillation process applied during the evaporation to BEC. The atom laser
is outcoupled by an inhomogenous magnetic field, applied along the waveguide
axis. The mean excitation number in the transverse modes is $\langle n \rangle
= 0.65 \pm 0.05$ for $m_F = 0 $ and $ \langle n \rangle = 0.8 \pm 0.3$ for the
low field seeker $m_F = -1$.
\\ ( http://arxiv.org/abs/0802.2601 , 832kb)
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arXiv:0802.2573
Date: Tue, 19 Feb 2008 01:40:00 GMT (373kb)
Title: Mean-field dynamics of a Bose Josephson junction in an optical cavity
Authors: J. M. Zhang, W. M. Liu, and D. L. Zhou
Categories: quant-ph
Comments: 10 pages, 2 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We study the mean-field dynamics of a Bose Josephson junction which is
dispersively coupled to a single mode of a high-finesse optical cavity. An
effective classical Hamiltonian for the Bose Josephson junction is derived and
its dynamics is studied in the perspective of phase portrait. It is shown that
the strong condensate-field coupling does alter the dynamics of the Bose
Josephson junction drastically. The possibility of coherent manipulating and
\textsl{in situ} observation of the dynamics of the Bose Josephson junction is
discussed.
\\ ( http://arxiv.org/abs/0802.2573 , 373kb)
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arXiv:0802.2553
Date: Mon, 18 Feb 2008 21:27:03 GMT (999kb)
Title: Ultracold atom-molecule collisions with fermionic atoms
Authors: J. P. D'Incao, B. D. Esry, and Chris H. Greene
Categories: physics.atom-ph
Comments: 6 pages, 2 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Elastic and inelastic properties of weakly bound s- and p-wave molecules of
fermionic atoms that collide with a third atom are investigated. Analysis of
calculated collisional properties of s-wave dimers of fermions in different
spin states permit us to compare and highlight the physical mechanisms that
determine the stability of s-wave and p-wave molecules. In contrast to s-wave
molecules, the collisional properties of p-wave molecules are found to be
largely insensitive to variations of the p-wave scattering length and that
these collisions will usually result in short molecular lifetimes. We also
discuss the importance of this result for both theories and experiments
involving degenerate Fermi gases.
\\ ( http://arxiv.org/abs/0802.2553 , 999kb)
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arXiv:0802.2811
Date: Wed, 20 Feb 2008 12:51:25 GMT (171kb)
Title: Effective-interaction approach to the many-boson problem
Authors: J. Christensson, C. Forss\'en, S. {\AA}berg and S.M. Reimann
Categories: cond-mat.other nucl-th physics.comp-ph
Comments: 4 pages, 4 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We show that the convergence behavior of the many-body numerical
diagonalization scheme for strongly interacting bosons in a trap can be
significantly improved by the Lee-Suzuki method adapted from nuclear physics:
One can construct an effective interaction that acts in a space much smaller
than the original Hilbert space. In particular for short-ranged forces and
strong correlations, the method offers a good estimate of the energy and the
excitation spectrum, at a computational cost several orders of magnitude
smaller than that required by the standard method.
\\ ( http://arxiv.org/abs/0802.2811 , 171kb)
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arXiv:0802.2923
Date: Wed, 20 Feb 2008 19:31:43 GMT (364kb)
Title: Diagrammatic Monte Carlo
Authors: Kris Van Houcke, Evgeny Kozik, Nikolay Prokof'ev, Boris Svistunov
Categories: cond-mat.stat-mech cond-mat.str-el
Comments: 15 pages, 7 figures. To appear in: Computer Simulation Studies in
Condensed Matter Physics XXI, Eds. D.P. Landau, S.P. Lewis, and H.B.
Schuttler (Springer Verlag, Heidelberg, Berlin 2008)
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Diagrammatic Monte Carlo (DiagMC) is a numeric technique that allows one to
calculate quantities specified in terms of diagrammatic expansions, the latter
being a standard tool of many-body quantum statistics. The sign problem that is
typically fatal to Monte Carlo approaches, appears to be manageable with
DiagMC. Starting with a general introduction to the principles of DiagMC, we
present a detailed description of the DiagMC scheme for interacting fermions
(Hubbard model), as well as the first illustrative results for the equations of
state.
\\ ( http://arxiv.org/abs/0802.2923 , 364kb)
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arXiv:0802.2902 (*cross-listing*)
Date: Wed, 20 Feb 2008 17:53:42 GMT (897kb)
Title: Reflection of OH molecules from magnetic mirrors
Authors: Markus Metsala, Joop J. Gilijamse, Steven Hoekstra, Sebastiaan Y. T.
van de Meerakker, and Gerard Meijer
Categories: physics.chem-ph physics.atom-ph
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We have reflected a Stark-decelerated beam of OH molecules under normal
incidence from mirrors consisting of permanent magnets. Two different types of
magnetic mirrors have been demonstrated. A long-range flat mirror made from a
large disc magnet has been used to spatially focus the reflected beam in the
longitudinal direction ("bunching"). A short-range curved mirror composed of an
array of small cube magnets has been used for transverse focusing of the
reflected beam.
\\ ( http://arxiv.org/abs/0802.2902 , 897kb)
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arXiv:0802.3019
Date: Thu, 21 Feb 2008 11:23:49 GMT (516kb)
Title: Faraday instability in a two-component Bose Einstein condensate
Authors: Aranya B. Bhattacherjee
Categories: cond-mat.other
Comments: 6 pages, 4 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Motivated by recent experiments on Faraday waves in Bose Einstein condensates
(BEC) we investigate the dynamics of two component cigar shaped BEC subject to
periodic modulation of the strength of the transverse confinement. It is shown
that two coupled Mathieu equations govern the dynamics of the system. We found
that the two component BEC in a phase mixed state is relatively more unstable
towards pattern formation than the phase segregated state.
\\ ( http://arxiv.org/abs/0802.3019 , 516kb)
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arXiv:0802.3158
Date: Thu, 21 Feb 2008 16:32:43 GMT (28kb)
Title: Probing ultra-cold Fermi atoms with a single ion
Authors: Y. Sherkunov, B. Muzykantskii, N. d'Ambrumenil, B. Simons
Categories: cond-mat.str-el
Comments: 4 pages, 2 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We study an ion embedded in an atomic Fermi gas and compute the two-photon
Raman photo-association rate of the ion and an atom. We show, that, as a
function of the detunings between the frequencies of the two incident lasers
and transition energies in the ion-atom system, the photo-association rate
directly measures the energy distribution in the Fermi gas around the ion. We
describe an experiment to measure the photo-association time using an ion trap.
The position of the ion can be scanned through the Fermi gas. This experiment
would provide a non-destructive probe of the local energy and spin-state
distribution of the Fermi gas with resolution on the nanometer scale.
\\ ( http://arxiv.org/abs/0802.3158 , 28kb)
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arXiv:0802.3202
Date: Thu, 21 Feb 2008 20:30:46 GMT (262kb,D)
Title: Interaction Quench in the Hubbard model
Authors: M. Moeckel and S. Kehrein
Categories: cond-mat.str-el
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Motivated by recent experiments in ultracold atomic gases that explore the
nonequilibrium dynamics of interacting quantum many-body systems, we
investigate the opposite limit of Landau's Fermi liquid paradigm: We study a
Hubbard model with a sudden interaction quench, that is the interaction is
switched on at time t=0. Using the flow equation method, we are able to study
the real time dynamics for weak interaction U in a systematic expansion and
find three clearly separated time regimes: i) An initial buildup of
correlations where the quasiparticles are formed. ii) An intermediate
quasi-steady regime resembling a zero temperature Fermi liquid with a
nonequilibrium quasiparticle distribution function. iii) The long time limit
described by a quantum Boltzmann equation leading to thermalization with a
temperature T proportional to U.
\\ ( http://arxiv.org/abs/0802.3202 , 262kb)
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arXiv:0802.3005
Date: Thu, 21 Feb 2008 09:43:01 GMT (39kb)
Title: Strong interaction between light and a single trapped atom without a
cavity
Authors: Meng Khoon Tey, Zilong Chen, Syed Abdullah Aljunid, Brenda Chng,
Florian Huber, Gleb Maslennikov, Christian Kurtsiefer
Categories: quant-ph
Comments: 11 pages, 4 figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Coupling of light to an atom at single quanta level with high probability is
a building block for many quantum information processing protocols. It is
commonly believed that efficient coupling is only achievable with the
assistance of a cavity. Here, we report on an observation of substantial
coupling between a light beam and a single $^{87}$Rb atom in a direct
extinction measurement by focusing light to a small spot with a single lens.
Our result opens a new perspective on processing quantum information carried by
light using atoms, and is important to many ongoing experiments that require
strong coupling of single photons to an atom in free space.
\\ ( http://arxiv.org/abs/0802.3005 , 39kb)
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arXiv:0802.3163
Date: Thu, 21 Feb 2008 16:48:11 GMT (657kb,D)
Title: Creation, manipulation, and detection of anyons in optical lattices
Authors: M. Aguado, G. K. Brennen, F. Verstraete, J. I. Cirac
Categories: quant-ph
Comments: 8 pages, 4 pdf figures
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
Anyons are particle-like excitations of strongly correlated phases of matter
with very exotic physical properties. Unlike bosons and fermions, they have
so-called fractional statistics, which are characterized by non-trivial changes
in the quantum wavefunction when two of them interchange their positions. Those
changes can, in turn, be used to perform quantum computations [A. Yu. Kitaev,
Annals Phys. 303, 2 (2003), arXiv:quant-ph/9707021v1], something which has
renewed the interest in the investigation of physical systems where anyons may
be present, manipulated and detected. In this work we show how this can be
accomplished in the context of optical lattices. Our proposal just requires one
(or several) ancilla particle(s) which can: (i) undergo single particle gates;
(ii) be moved close to each constituents of the lattice and undergo a simple
quantum gate; (iii) be detected. Recent experimental progress with atoms in
optical lattices makes our proposal feasible with present technology.
\\ ( http://arxiv.org/abs/0802.3163 , 657kb)
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arXiv:0802.3194
Date: Thu, 21 Feb 2008 19:47:46 GMT (233kb)
Title: A Deeper Look at Student Learning of Quantum Mechanics: the Case of
Tunneling
Authors: S. B. McKagan, K. K. Perkins, and C. E. Wieman
Categories: physics.ed-ph
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
\\
We report on a qualitative study of student learning of quantum tunneling in
traditional and reformed modern physics courses. In the reformed courses, which
were designed to address student difficulties found in previous research,
students still struggle with many of the same issues found in other courses,
but the reasons for these difficulties are more subtle, and many new issues are
brought to the surface. By explicitly discussing how to build models of
potential energy and relate these models to real physical systems, we have
opened up a floodgate of deep and difficult questions as students struggle to
make sense of these models. We conclude that the difficulties found in previous
research are the tip of the iceberg, and the real issue at the heart of student
difficulties in learning quantum tunneling is the struggle to build the complex
models that are implicit in experts' understanding but often not discussed
explicitly with students.
\\ ( http://arxiv.org/abs/0802.3194 , 233kb)
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arXiv:0709.2757
replaced with revised version Fri, 15 Feb 2008 13:05:03 GMT (15kb)
Title: Tkachenko modes in a superfluid Fermi gas at unitarity
Authors: Gentaro Watanabe, Marco Cozzini, and Sandro Stringari
Categories: cond-mat.other cond-mat.supr-con
Comments: 5 pages, 1 figure; minor changes, now published as Phys. Rev. A 77,
021602(R) (2008)
\\ ( http://arxiv.org/abs/0709.2757 , 15kb)
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arXiv:0710.4220
replaced with revised version Thu, 14 Feb 2008 23:31:29 GMT (646kb)
Title: Ultracold atoms in optical lattices generated by quantized light fields
Authors: Christoph Maschler, Igor B. Mekhov, Helmut Ritsch
Categories: quant-ph
Comments: 17 pages, 10 figures, Published version
Journal-ref: Eur. Phys. J. D,46, 545-560 (2008)
DOI: 10.1140/epjd/e2008-00016-4
\\ ( http://arxiv.org/abs/0710.4220 , 646kb)
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arXiv:quant-ph/0702109
replaced with revised version Mon, 18 Feb 2008 11:14:03 GMT (62kb)
Title: Vector Cooper Pairs and Coherent-Population-Trapping-like States in
Ensemble of Interacting Fermions
Authors: A.V. Taichenachev and V.I. Yudin
Categories: quant-ph cond-mat.str-el cond-mat.supr-con physics.atom-ph
Comments: revtex, 12 pages, 2 figures
\\ ( http://arxiv.org/abs/quant-ph/0702109 , 62kb)
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arXiv:0711.3562
replaced with revised version Mon, 18 Feb 2008 07:29:18 GMT (106kb)
Title: EPR argument and Bell inequalities for Bose-Einstein spin condensates
Authors: Franck Lalo\"e (LKB - Lhomond), William J. Mullin (UMASS)
Categories: quant-ph cond-mat.other
Comments: a few misprints corrected, a reference added. This is the published
version
Proxy: ccsd hal-00189827
Journal-ref: Physical Review A: Atomic, Molecular and Optical Physics 77 (2008)
022108
DOI: 10.1103/PhysRevA.77.022108
\\ ( http://arxiv.org/abs/0711.3562 , 106kb)
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arXiv:0706.3686
replaced with revised version Tue, 19 Feb 2008 09:58:02 GMT (377kb)
Title: Non-equilibrium solid state quantum condensates: the effect of particle
flux on density profiles
Authors: Jonathan Keeling, Natalia G. Berloff
Categories: cond-mat.other
Comments: New content on stability of symmetryic solutions and possibility of
spontaneous vortex lattice. 4 pages, 3 figures
\\ ( http://arxiv.org/abs/0706.3686 , 377kb)
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arXiv:0707.4189
replaced with revised version Wed, 20 Feb 2008 02:19:01 GMT (179kb)
Title: Superfluid-Insulator Transition and Fermion Pairing in Bose-Fermi
Mixtures
Authors: Kun Yang
Categories: cond-mat.supr-con cond-mat.str-el
Comments: Expanded version as appeared in print
Journal-ref: Phys. Rev. B 77, 085115 (2008)
DOI: 10.1103/PhysRevB.77.085115
\\ ( http://arxiv.org/abs/0707.4189 , 179kb)
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arXiv:0801.4466
replaced with revised version Wed, 20 Feb 2008 10:58:03 GMT (301kb)
Title: 2PI nonequilibrium versus transport equations for an ultracold Bose gas
Authors: Alexander Bransch\"adel and Thomas Gasenzer
Categories: cond-mat.other hep-ph
Comments: 24 pages, 7 figures. References added
Report-no: Heidelberg preprint HD-THEP-08-02
\\ ( http://arxiv.org/abs/0801.4466 , 301kb)
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arXiv:0707.0675
replaced with revised version Thu, 21 Feb 2008 17:59:20 GMT (265kb)
Title: Disorder-Induced Order in Two-Component Bose-Einstein Condensates
Authors: Armand Niederberger, Thomas Schulte, Jan Wehr, Maciej Lewenstein,
Laurent Sanchez-Palencia, Krzysztof Sacha
Categories: cond-mat.other cond-mat.dis-nn
Comments: 4 pages, 3 figures
Journal-ref: Phys. Rev. Lett. 100, 030403 (2008)
\\ ( http://arxiv.org/abs/0707.0675 , 265kb)
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arXiv:0801.3465
replaced with revised version Thu, 21 Feb 2008 19:20:50 GMT (51kb)
Title: Mixtures of strongly interacting bosons in optical lattices
Authors: P. Buonsante, S.M. Giampaolo, F. Illuminati, V. Penna and A. Vezzani
Categories: cond-mat.other quant-ph
Comments: 9 pages, 3 figures; some changes in the text have been introduced;
the title has been slightly changed
\\ ( http://arxiv.org/abs/0801.3465 , 51kb)
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arXiv:0802.2101
replaced with revised version Wed, 20 Feb 2008 23:14:54 GMT (100kb)
Title: Stability of Superflow for Ultracold Fermions in Optical Lattices
Authors: A.A. Burkov, Arun Paramekanti
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 4+ pages, 2 figures, typos corrected, references added
\\ ( http://arxiv.org/abs/0802.2101 , 100kb)
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arXiv:0711.3831 (*cross-listing*)
replaced with revised version Thu, 21 Feb 2008 16:48:06 GMT (546kb,D)
Title: Generation of macroscopic superposition states in ring superlattices
Authors: Andreas Nunnenkamp, Ana Maria Rey, Keith Burnett
Categories: cond-mat.other quant-ph
Comments: 9 pages, 10 figures; minor corrections
\\ ( http://arxiv.org/abs/0711.3831 , 546kb)
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arXiv:0708.2638
replaced with revised version Thu, 21 Feb 2008 01:14:59 GMT (82kb)
Title: Three-State Feshbach Resonances Mediated By Second-Order Couplings
Authors: Christopher J. Hemming, Roman V. Krems
Categories: physics.atom-ph physics.chem-ph
Comments: 27 pages, 4 figures; added a reference; journal reference/DOI refer
to final published version, which is a shortened and modified version of this
preprint
Journal-ref: Phys. Rev. A 77, 022705 (2008)
DOI: 10.1103/PhysRevA.77.022705
\\ ( http://arxiv.org/abs/0708.2638 , 82kb)
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Till next time,
Matt.
-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Mon Mar 03 2008 - 09:49:03 EST
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