A/Prof Ben Powell

COPE | Physics | SPS | EPSA | University of Queensland
strongly correlated electrons | organic electronics | biophysics
glasses (radio interview)
PHYS2020 (Thermodynamics and CMP) | Quantum Many-Body Theory reading group
postdocs | students | former postdocs | former students
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A/Prof Ben Powell

2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | proceedings

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Haldane phase in the Hubbard model for the organic molecular compound Mo3S7(dmit)3
C. Janani, J. Merino, I. P. McCulloch, and B. J. Powell
Accepted for publication in Phys. Rev. Lett. (preprint arXiv:1401.6605)
Low-energy effective theories of the two-thirds filled Hubbard model on the triangular necklace lattice.
C. Janani, J. Merino, I. P. McCulloch, and B. J. Powell
Phys. Rev. B 90, 035120 (2014).)
Spin liquid phase in a spatially anisotropic frustrated antiferromagnet: A Schwinger boson mean-field approach.
J. Merino, M. Holt, and B. J. Powell
Phys. Rev. B 89, 245112 (2014).
Spin liquid phase in the semiclassical theory of the Heisenberg model on an anisotropic triangular lattice with ring exchange.
M. Holt, B. J. Powell and J. Merino
Phys. Rev. B 89, 174415 (2014).
Synthesis and properties of pyrrolo[3,2-b]pyrrole-1,4-diones (isoDPP) derivatives.
D. Gendron, E. Gann, K. Pattison, F. Maasoumi, C. R. McNeill, S. E. Watkins, P. L. Burn, B. J. Powell and P. E. Shaw
J. Mat. Chem. C 2, 4276 (2014).

 
In-plane superfluid density and microwave conductivity of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br: evidence for d-wave pairing and resilient quasiparticles.
S. Milbradt, A. A. Bardin, C. J. S. Truncik, W. A. Huttema, A. C. Jacko, P. L. Burn, S.-C. Lo, B. J. Powell and D. M. Broun
Phys. Rev. B. 88, 064501 (2013).
Hydration-Controlled X-Band EPR Spectroscopy: A Tool for Unravelling the Complexities of the Solid-State Free Radical in Eumelanin.
A. B. Mostert, G. R. Hanson, T. Sarna, I. R. Gentle, B. J. Powell, and P. Meredith
J. Phys. Chem. B 117, 4965 (2013).
Three-dimensional Carbazole-based Dendrimers: Model Structures for Studying Charge Transport in Amorphous Films.
K. Mutkins, S. S. Y. Chen, A. Pivrikas, M. Aljada, P. L. Burn, P. Meredith and B. J. Powell
Polym. Chem. 4, 916 (2013).

 
Geometrical frustration in the spin liquid β'-Me3EtSb[Pd(dmit)2]2 and the valence bond solid Me3EtP[Pd(dmit)2]2.
E. P. Scriven and B. J. Powell
Phys. Rev. Lett. 109, 097206 (2012).
Kinetics of Charge Transfer Processes in Organic Solar Cells: Implications for the Design of Acceptor Molecules.
E. P. Schwenn, K. Gui, Y. Zhang, P. L. Burn, P. Meredith and B. J. Powell
Org. Electron. 13, 2538 (2012).
On the origin of electrical conductivity in the bio-electronic material melanin.
A. B. Mostert, B. J. Powell, F. L. Pratt, G. R. Hanson, T. Sarna, I. R. Gentle and P. Meredith
Proc. Nat. Acad. Sci. 109, 8943 (2012).

This work was reported in Chemistry in Australia.
Electron-phonon coupling as an order-one problem.
B.J. Powell, M.R. Pederson and T. Baruah
Crystals 2, 236 (2012).
On the origin of electrical conductivity in the bio-electronic material melanin.
A. B. Mostert, B. J. Powell, I. R. Gentle and P. Meredith
Appl. Phys. Lett. 100, 093701 (2012).
Effects of Fluorination on Iridium(III) Complex Phosphorescence: Magnetic Circular Dichroism and Relativistic Time-Dependent Density Functional Theory.
A. R. G. Smith, M. J. Riley, P. L. Burn, I. R. Gentle, S.-C. Lo and B. J. Powell
Inorg. Chem. 51, 2821 (2012)
Superconductivity suppression and peak resistivity enhancement for thin crystals of κ-(BEDT-TTF)2Cu(SCN)2.
A. Bardin, P. L. Burn, S.-C. Lo and B. J. Powell
Phys. Stat. Sol. B 249, 979 (2012).

 
Spin-orbit coupling in phosphorescent Ir(III) complexes.
A. R. G. Smith, P. L. Burn and B. J. Powell
ChemPhysChem 12, 2429 (2011)
Electronic correlations in organometallic complexes.
A. C. Jacko and B. J. Powell
Chem. Phys. Lett. 508, 22 (2011).
Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors.
B. J. Powell and R. H. McKenzie
Rep. Prog. Phys. 74, 056501 (2011).
An introduction to effective low-energy Hamiltonians in condensed matter physics and chemistry.
B. J. Powell
In Computational Methods for Large Systems: Electronic Structure Approaches for Biotechnology and Nanotechnology J. R. Reimers (Ed.) (Wiley, Hoboken, 2011).
Preprint: arXiv:0906.1640
Relativistic Effects in a phosphorescent Ir(III) complex.
A. R. G. Smith, M. J. Riley, S.-C. Lo, P. L. Burn, I. R. Gentle and B. J. Powell
Phys. Rev. B 83, 041105(R) (2011)
Calculation of solid state molecular ionisation energies and electron affinities for organic semiconductors.
E. P. Schwenn, P. L. Burn and B. J. Powell
Org. Ele. 12, 394 (2011).
A tunable metal-organic resistance thermometer.
A. P. Stephenson, A. P. Micolich, K. Lee, P. Meredith and B. J. Powell
ChemPhysChem 12, 116 (2011).

This work was reported by Materials Today, Wired, Gizmodo, PhysOrg (twice!), Crunch Gear, Chemistry Views, Top News, IBN Live, The Register, Science Alert, New Electronics, Printed Electronics World, Zee News, China Plastic and Rubber Journal, UQ News, The Hindu, Sify News, Campus Daily, PCB Design, The End Of The Internet, SMT Magazine, Electronics Manufacture and Test Worldwide, Indian Express, Solar Solution, UNIS, Zeit News, TG Daily, I2P, TekEra Solutions, Articles Hub, Printed Circuit Board 007, Impact Lab, Industry Search, Flexible Circuit News and Information, News Land (in Russian), Greengate (in Estonian), Thong Tin Cong Nghe (in Vietnamese)

 
Models of organometallic complexes for optoelectronic applications.
A. C. Jacko, Ross H. McKenzie and B. J. Powell
J. Mat. Chem. 20, 10301 (2010).
Sensitivity of the photo-physical properties of organometallic complexes to small chemical changes.
A. C. Jacko, B. J. Powell, Ross H. McKenzie
J. Chem. Phys. 133, 124314 (2010)
Competition between Superconductivity and Weak Localization in Metal-Mixed Ion-Implanted Polymers.
A. P. Stephenson, A. P. Micolich, U. Divakar, P. Meredith and B. J. Powell
Phys. Rev. B 81, 144520 (2010)
Towards molecular energy calculations on a quantum computer.
B. P. Lanyon, J. D. Whitfield, G. G. Gillet, M. E. Goggin, M. P. Almeida, I. Kassal, J. D. Biamonte, M. Mohseni, B. J. Powell, M. Barbieri, A. Aspuru-Guzik, and A. G. White
Nature Chem. 2, 106 (2010).

Also see the News & Views article about the this paper by Kenneth Brown.

This work was reported by New Scientist, Wired, Physics World, Chemistry World, Science News, Milenio (in Spanish - google translation), Science Backstage (in Italian - google translation), cnBeta.com (in Madarin - google translation), Hayadan (in Hebrew - google translation), Enquirer, Tehran Times, Palestine Telegraph, Science Alert, MSNBC, Google News, Yahoo News, Computerworld, Ars Technica, chemie.de, Popsci, PhysOrg, Nanowerk, eScience News, Softpedia, Next Big Future, Innovations Report, Science Daily, AZonano, EurekAlert, Scientific Computing, R&D Magazine, Nanotechnology Now, Science Centric, Zee News, Birmingham Star, Science News, Sindh Today, Thaindian News, Little About, Malaysia Sun, Daily India, Scientist Live, Red Orbit, Bioscience Technology, Science Blog, Oxford Science Blog, domain-b, UQ News, Harvard Crimson, and Harvard Gazette
Gaseous Adsorption in Melanins: Hydrophilic Biomacromolecules with High Electrical Conductivities.
A. B. Mostert, K. J. P. Davy, J. L. Ruggles, B. J. Powell, I. R. Gentle, and P. Meredith
Langmuir, 26, 412 (2010).

 
Effective Coulomb interactions within BEDT-TTF dimers.
E. Scriven and B. J. Powell
Phys. Rev. B 80, 205107 (2009).
Ionic Hubbard model on a triangular lattice for Na0.5CoO2, Rb0.5CoO2 and K0.5CoO2: Mean-field slave boson theory.
B. J. Powell, J. Merino, and R. H. McKenzie
Phys. Rev. B 80, 085113 (2009).
Spin Fluctuations and the Pseudogap in Organic Superconductors.
B. J. Powell, E. Yusuf, and R. H. McKenzie
Phys. Rev. B 80, 054505 (2009).
Electronic and magnetic properties of the ionic Hubbard model on the striped triangular lattice at 3/4 filling.
J. Merino, R. H. McKenzie, and B. J. Powell
Phys. Rev. B 80, 045116 (2009).
Synthetic routes to new physics.
B. J. Powell
Chem. Aust., 76, 18 (2009).

Invited feature article.
A unified explanation of the Kadowaki-Woods ratio in strongly correlated metals.
A. C. Jacko, J. O. Fjaerestad, and B. J. Powell
Nature Phys. 5, 422 (2009).

Also see discussion of this paper in condensed concepts (blog)
Preparation of Metal Mixed Plastic Superconductors: Electrical Properties of Tin-Antimony Thin Films on Plastic Substrates.
A.P. Stephenson, U. Divakar, A.P. Micolich, P. Meredith, and B. J. Powell
J. Appl. Phys. 105, 093909 (2009).
Interplay of frustration, magnetism, charge ordering, and covalency in a model of Na0.5CoO2.
J. Merino, B. J. Powell, and R. H. McKenzie
Phys. Rev. B 79, 161103(R) (2009).
Vertex Corrections and the Korringa Ratio in Strongly Correlated Electron Materials.
E. Yusuf, B. J. Powell, and R. H. McKenzie
J. Phys.: Condens. Matter 21, 195601 (2009).
Toward the parametrization of the Hubbard model for salts of bis(ethylenedithio)tetrathiafulvalene: A density functional study of isolated molecules.
E. Scriven and B. J. Powell
J. Chem. Phys. 130, 104508 (2009).

Also see discussion of this paper in condensed concepts (blog)

 
A phenomenological model of the superconducting state of the Bechgaard salts.
B.J. Powell
J. Phys.: Condens. Matter 20, 345234 (2008).
Pomeranchuk instability: symmetry breaking and experimental signatures.
J. Quintanilla, C. Hooley, B. J. Powell, A. J. Schofield and M. Haque
Physica B 403, 1279 (2008).

 
Transition dipole strength of eumelanin.
J.J. Riesz, J.B. Gilmore, R.H. McKenzie, B.J. Powell, M.R. Pederson, and P. Meredith
Phys. Rev. E 76, 021915 (2007)
Antiferromagnetic Spin Fluctuations in the Metallic Phase of Quasi-Two-Dimensional Organic Superconductors.
E. Yusuf, B.J. Powell and R.H. McKenzie
Phys. Rev. B 75, 214515 (2007)
Convergent Proton Transfer Photocycles Violate Mirror Image Symmetry in a Key Melanin Monomer.
S. Olsen, J. Riesz, I. Mahadevan, A. Coutts, J. Bothma, B.J. Powell, R. H. McKenzie, S.C. Smith and P. Meredith
J. Am. Chem. Soc., 129, 6672, (2007)
Symmetry of the Superconducting Order Parameter in Frustrated Systems Determined by the Spatial Anisotropy of Spin Correlations.
B.J. Powell and R.H. McKenzie
Phys. Rev. Lett. 98, 027005 (2007)

 
Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis.
B.J. Powell
J. Phys.: Condens. Matter 18, L575 (2006)

Strong electronic correlations in superconducting organic charge transfer salts.
B.J. Powell and R.H. McKenzie
J. Phys.: Condens. Matter 18, R827 (2006)

This paper was selected by Marshall Stoneham and David Ferry, the Editors-in-Chief of J. Phys.: Condens. Matter, for their TOP PAPERS 2006 SHOWCASE

Superconductivity in Metal-mixed Ion-Implanted Polymer Films.
A.P. Micolich, E. Tavenner, B.J. Powell, A.R. Hamilton, M.T. Curry, R.E. Giedd and P. Meredith
Appl. Phys. Lett. 89, 152503 (2006)

Ferromagnetism, paramagnetism and a Curie-Weiss metal in an electron doped Hubbard model on a triangular lattice.
J. Merino, B.J. Powell and R.H. McKenzie
Phys. Rev. B 73, 235107 (2006)

The effect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2.
J.G. Analytis, A. Ardavan, S.J. Blundell, R.L. Owen, E.F. Garman, C. Jeynes and B.J. Powell
Phys. Rev. Lett. 96, 177002 (2006)

Towards Structure-Property-Function Relationships for Eumelanin.
P. Meredith, B.J. Powell, J. Riesz, S. Nighswander-Rempel, M.R. Pederson and E. Moore
Soft Matter 2, 37 (2006)

Chemical and Structural Disorder in Eumelanins - A Possible Explanation for Broad Band Absorbance.
M.L. Tran, B.J. Powell and P. Meredith
Biophys. J. 90, 743 (2006)

 
Half-Filled Layered Organic Superconductors and the Resonating-Valence-Bond Theory of the Hubbard-Heisenberg Model.
B.J. Powell and R.H. McKenzie
Phys. Rev. Lett. 94, 047004 (2005)

5,6-dihydroxyindole-2-carboxylic acid (DHICA): a First Principles Density-Functional Study.
B.J. Powell
Chem. Phys. Lett. 402, 111 (2005)

Broad Band Photon Harvesting Biomolecules for Photovoltaics.
P. Meredith, B.J. Powell, J. Riesz, R. Vogel, D. Blake, I. Kartini, G. Will and S. Subianto
In Artificial Photosynthesis: From Basic Biology to Industrial Application (Wiley, Chichester, 2005) C. Critchley and A. Collings (Eds.)

 
A First Principles Density-Functional Calculation of the Electronic and Vibrational Structure of the Key Melanin Monomers.
B.J. Powell, T. Baruah, N. Bernstein, K. Brake, R.H. McKenzie, P. Meredith and M.R. Pederson
J. Chem. Phys. 120, 8608 (2004)

On the Relationship Between the Critical Temperature and the London Penetration Depth in Layered Organic Superconductors.
B.J. Powell and R.H. McKenzie
J. Phys.: Condens. Matter 16 L367-L373 (2004)

First-principles density-functional calculation of the Raman spectra of BEDT-TTF.
K. Brake, B.J. Powell, R.H. McKenzie, M.R. Pederson and T. Baruah
J. Phys. IV (France) 114, 293 (2004)

The origin of the difference of the superconducting critical temperatures of the βH and βL phases of β-(BEDT-TTF)2I3.
B.J. Powell
J. Phys. IV (France) 114, 363 (2004)

Dependence of the Superconducting Transition Temperature of Organic Molecular Crystals on Intrinsically Non-Magnetic Disorder: a Signature of either Unconventional Superconductivity or Atypical Local Magnetic Moment Formation.
B.J. Powell and R.H. McKenzie
Phys. Rev. B 69, 024519 (2004)

 
The gap equations for spin singlet and triplet ferromagnetic superconductors.
B.J. Powell, J.F. Annett and B.L. Györffy
J. Phys. A 36, 9289 (2003)

Competition Between Disorder and Exchange Splitting in Superconducting ZrZn2.
B.J. Powell, J.F. Annett and B.L. Györffy
J. Phys.: Condens. Matter 15, L235 (2003)

 
The Behaviour of a Triplet Superconductor in a Spin Only Magnetic Field.
B.J. Powell, J.F. Annett and B.L. Györffy
In Ruthenate and Rutheno-Cuprate Materials: Unconventional Superconductivity, Magnetism and Quantum Phase Transitions Springer Lecture Notes in Physics. 603 C. Noce, A. Vecchione, M. Cuoco, A. Romano (Eds.) (Springer, Berlin, 2002).

Conference proceedings
 
The Melanins - A Class of Bio-organic Conductor.
P. Meredith, J. Riesz, C. Giacomantonio, S. Subianto, G. Will, A. Micolich and B.J. Powell
The Proceedings of the International Conference on Science and Technology of Synthetic Metals (ICSM 2004), (University of Wollongong Intelligent Polymer Research Institute, Wollongong, 2004).