David Neilson

B.Sc.(Hons) Melbourne, M.S., Ph.D. New York (Stony Brook)

Professor of Physics

             University of Antwerp
artner Investigator
             Australian Research Council FLEET Centre of Excellence                 
    Career Summary

David Neilson is author of more than 150 refereed research articles, review chapters in books, refereed conference reports and editor of review books.

  Superfluidity in graphene multilayers... A new quantum phenomenon in bilayers of graphene predicted by David Neilson and his co-workers has been observed.   In May 2018 Physical Review Letters published an article by a University of Texas at Austin experimental group confirming a theoretical prediction (Reference [25]) by David Neilson in collaboration with Andrea Perali (University of Camerino) and Alexander Hamilton (University of New South Wales, Sydney) that in a system of double bilayer graphene, and more generally in other semiconductors that can be made into atomically thin flakes, quantum  condensation and superfluid flow of condensed pairs of electrons and holes should occur at low electron densities.  This is a state of matter that had been searched for forty years, but not before observed.  Creation of this new quantum state in electronic devices, opens up novel opportunities for quantum-technological applications, to be developed in the Future Low Energy Electronic Transport (FLEET) Centre of Excellence http://www.fleet.org.au/.

Supersolidity... is a counter-intuitive quantum state in which a rigid lattice of particles flows without resistance. It has not yet been unambiguously observed.
In Reference [1] David Neilson and co-workers show that a supersolid ground state of excitons in a double-layer semiconductor heterostructure should exist
over a wide range of readily attainable layer separations larger than the separations typical in recent experiments.

This supersolid conforms with the original supersolid proposed
as a phase of Helium-4 by Geoffrey Chester, a solid with one particle per supersolid site.  This makes it quite distinct from alternative supersolid versions reported in cold-atom systems of a periodic density modulation or clustering of the superfluid.
The new phase appears at layer separations much smaller than the predicted exciton normal solid, and it persists up to a solid--solid transition where the quantum phase coherence collapses.   The ranges of layer separations and exciton densities for the supersolid are well within reach of current experimental capabilities.


    Short Bio
Born in Sydney, Australia, David Neilson completed his primary and secondary schooling at Geelong Grammar School, near Melbourne
He studied Physics and Mathematics at the University of Melbourne, graduating with a B.Sc. with First Class Honours in 1968 under the supervision of Geoffrey Opat.
He went to New York as a Fulbright scholar in 1969 and completed an M.S. degree in High Energy Particle Physics and Field Theory under the supervision of Ben Lee at the State University of New York (Stony Brook) in 1971.
He switched his research to Condensed Matter Physics, working with Gerald E. Brown jointly at Stony Brook and the Niels Bohr Institute in Copenhagen.
His doctoral project was on the Many Body Problem for the strongly interacting quantum system of electrons in solids.
Obtaining his Ph.D. in 1974 he took an N.S.F. research Fellowship at Northwestern University in Chicago working with Chia-Wei Woo on the quantum solidification of Helium and on the possibility of the solidification of nuclear matter under the intense pressures found in neutron stars. 

In 1975 he took up a position of Assistant Professor at the University of Southern California in Los Angeles.
In 1978 he moved to the University of New South Wales in Sydney as Senior Lecturer (Assistant Professor). 
From 1985-1994 he was Associate Professor, and from 1995 until 2003 Professor of Physics at New South Wales.  
He maintains his ties with New South Wales as an Adjunct Professor. 
He has held visiting positions at the Niels Bohr Institute, (NORDITA Fellow), the Max Planck Institute, Stuttgart (Research Scientist),
Nottingham University (S.E.R.C. Visiting Fellow), the International Centre for Theoretical Physics, Trieste, Italy (Research Director),
Université de Paris VI (Visiting Fellow), and the Scuola Normale Superiore, Pisa (Visiting Professor). 

From 2005 to 2017 he was chiara fama Professor in Italy at the historic (founded 1336) University of Camerino and
Research Associate with the National Enterprise for NanoScience and NanoTechnology (NEST) Centre at the Scuola Normale Superiore in Pisa.

Since 2018 David Neilson has been Professor of Physics at the
University of Antwerp.
He is a Partner Investigator of the Australian Research Council Centre of Excellence "Future Low Energy Electronic Transport" (FLEET)  http://www.fleet.org.au/.

    Research Interests        
David Neilson has wide experience in the field of semiconductor theory and has studied exotic quantum phases of one- and two-dimensional systems found in semiconductor devices. 
His recent work has been on superfluidity in graphene bilayer and double transition metal dichalcogenides (TMD) monolayer devices.     

The recently experimentally confirmed prediction of superfluidity (Reference [25]) has attracted 200 citations.

In a superfluid, scattering is prohibited by quantum statistics, which means that bound neutral pairs electrons and holes (called excitons) can flow without heat-wasting resistance in new device structures of atomically thin semiconductors.  Immediate application is for devices in the computing industry.  These already use 8% of all electricity, a figure that is doubling every 10 years.  The task is to develop new types of electronic conduction without resistance in solid-state systems at room temperature.  This would form the basis of a new type of switching devices (transistors) with vastly lower energy consumption per computation than silicon CMOS devices.

David Neilson with his coworkers have also predicted new states of matter for electrons in coupled bilayers in the form of a coupled electron crystalline solid or a charge density waves. Reference [65] with 170 citations, has stimulated a large number of follow-up studies of bi-layers in zero magnetic field. The predictions that a coupled crystal does form at relatively high densities were confirmed in numerical simulation studies.
There has been a CECAM (France) conference devoted to coupled bi-layers in zero magnetic field resulting from the predicions in Reference [65].

He developed comprehensive diagrammatic many-body calculations incorporating functional conserving techniques for conduction electrons. 
He developed a quantum generalization of the classical glass equations with applications to conduction electrons, extended it to include impurities in interacting electron 2D layers,  and showed that this could lead to a transition to a solid electron glass state.
He has worked on ground state, localization and transport properties in disordered electron 2D systems.
He has studied the effect of strong correlations between electron spins in electron systems at low density. 
He has studied the decisive effect that impurities have on the ground state of interacting electrons in quasi one-dimensional quantum wires. 
Before taking up his chiara fama Chair in Italy, he had had continuous funding as Chief Investigator of Major Research Grants from the Australian Research Council for an uninterrupted period of 25 years.

    Scholarly Activities

President of the International Conference series Strongly Coupled Coulomb Systems 2016-
Past-President of the International Conference series International Conferences on Recent Progress in Many Body Theories 2014-2020.

Organiser of international conferences including :
Multi-Condensate Superconductors and Superfluids in Solids and Ultracold Gases, Camerino 2014,
International Conference on Strongly Coupled Coulomb Systems, Camerino 2008,
International Conference on Novel Quantum Systems Italy 2005, International Conference on Soft Condensed Matter, Sydney 2003,
International Workshop on Condensed Matter Theories Canberra 2002,
Australian Institute of Physics Biennial Congress, Sydney 2002.

Chair of Program Committee for International Conferences on Strongly Coupled Coulomb Systems, Camerino 2008, Budapest 2011, Santa Fe 2014, Kiel 2017.

Chair of Eugene Feenberg Memorial Medal Committee for RPMBT-16 Bariloche 2011 and RPMBT-21 Chapel Hill North Carolina 2022.

International Advisory Committees for Conferences including
International Conferences on Recent Progress in Many Body Theories,
International Workshops on Condensed Matter Theories, and
International Conferences on Strongly Coupled Coulomb Systems

Convenor of the Annual Gordon Godfrey Workshops on Condensed Matter Physics, Sydney for fifteen years.

Referee for international physics journals, including Physical Review Letters, Physical Review, Scientific Reports, Physics Letters, Journal of Physics, Solid State Communications.

Examiner for external PhD theses.

Reviewer of grant applications for Research Council organisations in Australia (A.R.C.) Belgium, Canada (N.S.E.R.C.), U.K. (S.E.R.C.), U.S.A. (N.S.F. and D.O.E.).

Fellow of the Australian Institute of Physics, member of the American Physical Society and the Institute of Physics (U.K.).   

    Selected Publications
         Representative examples of David Neilson's 150 publications

  1. Chester Supersolid of Spatially Indirect Excitons in Double-Layer Semiconductor Heterostructures, Sara Conti, Andrea Perali, Alexander R. Hamilton, Milorad Milošević, Francois Peeters, and David Neilson, Phys. Rev. Lett. 130, 057001 (2023)

  2. Excitonic superfluidity in electron-hole bilayer systems, David Neilson, in Encyclopedia of Condensed Matter Physics, 2nd edition, ed. Tapash Chakraborty, (Elsevier, Oxford, 2023)

  3. Josephson effect as a signature of electron-hole superfluidity in bilayers of van der Waals heterostructures, Filippo Pascucci, Sara Conti, David Neilson, Jacques Tempere, and Andrea Perali, Phys. Rev. B Letter 106, L220503 (2022)

  4. Electron-hole superfluidity in strained Si/Ge type II heterojunctions, Sara Conti, Samira Saberi-Pouya, Andrea Perali, Michele Virgilio, Francois M. Peeters, Alexander R. Hamilton, Giordano Scappucci, and David Neilson, npj Quantum Materials 6, 41 (2021)

  5.        Effect of Mismatched Electron-Hole Effective Masses on Superfluidity in Double Layer Solid-State Systems, Sara Conti, Andrea Perali, Francois M. Peeters, and David Neilson, Condens. Matter 6, 14 (2021)

  6.        Transition Metal Dichalcogenides as Strategy for High Temperature Electron-Hole Superfluidity, A doping-dependent switch from one- to two-component superfluidity at temperature above 100K in coupled electron-hole         Van der Waals heterostructures, S. Conti, M. Van der Donck, A. Perali, F. M. Peeters, and D. Neilson, Phys. Rev. B Rapid Comm. 101, 220504(R) (2020)

  7.       Experimental conditions for observation of electron-hole superfluidity in GaAs heterostructures, Samira Saberi-Pouya, Sara Conti, Andrea Perali, Andrew F. Croxall, Alexander R. Hamilton, Francois M. Peeters, and David               Neilson, Phys. Rev. B Rapid Comm. 101, 140501(R) (2020)

  8.       Three-dimensional electron-hole superfluidity in a superlattice close to room temperature, M. Van der Donck, S. Conti, A. Perali, A. R. Hamilton, B. Partoens, F. M. Peeters, and D. Neilson, Phys. Rev. B Rapid Comm. 102, 060503(R) (2020)

  9. Two-dimensional semiconductors host high-temperature exotic state, A. Chaves and D. Neilson, Nature 574, 39 (2019)

  10. Coulomb drag in strongly coupled quantum wells: temperature dependence of the many-body correlations, M. Zarenia, S. Conti, F. M. Peeters, and D. Neilson, Appl. Phys. Lett. 115, 202105 (2019)

  11. Multicomponent screening and superfluidity in gapped electron-hole double bilayer graphene with realistic bands, S. Conti, A. Perali, F. M. Peeters, and D. Neilson, Phys. Rev. B 99, 144517 (2019)   

  12. Electric-field-induced emergent electrical conductivity in graphene oxide, M. Neek-Amal, R. Rashidi, Rahul R. Nair, D. Neilson, and F. M. Peeters, Phys. Rev. B 99, 115425 (2019)

  13. Correlation functions in electron-electron and electron-hole double quantum wells: Temperature, density, and barrier-width dependence, M. W. C. Dharma-wardana, D. Neilson, and F. M. Peeters, Phys. Rev. B 99, 035303 (2019)

  14. Multiband Mechanism for the Sign Reversal of Coulomb Drag Observed in Double Bilayer Graphene Heterostructures, M. Zarenia, A. R. Hamilton, F. M. Peeters, and D. Neilson, Phys. Rev. Lett. 121, 036601 (2018)

  15. Evidence from quantum Monte Carlo of large gap superfluidity and BCS-BEC crossover in double electron-holelayers, Pablo Lo'pez Ri'os, Andrea Perali, Richard J. Needs, and David Neilson, Phys. Rev. Lett. 120, 17701 (2018)

  16. Multicomponent Electron-Hole Superfluidity and the BCS-BEC Crossover in Double Bilayer Graphene, S. Conti,A. Perali, F. M. Peeters, and D. Neilson, Phys. Rev. Lett. 119, 257002 (2017)

  17. Inhomogeneous phases in coupled electron-hole bilayer graphene sheets: Charge Density Waves and CoupledWigner Crystals, M. Zarenia, D. Neilson, and F. M. Peeters, Sci. Reports 7, 11510 (2017)

  18. Wigner crystallization in transition metal dichalcogenides: A new approach to correlation energy, M.Zarenia, D. Neilson, B. Partoens, and F. M. Peeters, Phys. Rev. B 95, 115438 (2017)

  19.        Tuning the BEC-BCS crossover in electron-hole double bilayer graphene superfluidity using multiband effects, Sara Conti, Andrea Perali, David Neilson, and Francois Peeters, Belgian Phys. Soc. Journal 3, 6 (2017)
  20. Large gap electron-hole superfluidity and shape resonances in coupled graphene nanoribbons, M. Zarenia, A. Perali, F. M. Peeters, and D. Neilson, Sci. Reports 6, 24860 (2016)

  21. Many-body electron correlations in graphene, David Neilson, Andrea Perali, and Mohammad Zarenia, J. Phys.: Conf. Series 702, 012008 (2016)

  22. Using magnetic stripes to stabilize superfluidity in electron-hole double monolayer graphene, LucaDell'Anna, Andrea Perali, Lucian Covaci, and David Neilson, Phys. Rev. B, Rapid Comm. 92, 220502(R) (2015)

  23. Enhancement of electron-hole superfluidity in double few-layer graphene, M. Zarenia, A. Perali, D. Neilson, and F. M. Peeters, Sci. Reports 4, 7319 (2014)

  24. Excitonic superfluidity and screening in electron-hole bilayer systems, D. Neilson, A. Perali and A. R. Hamilton,Phys. Rev. B Rapid Comm. 89, 060502(R) (2014)

  25. High-Temperature Superfluidity in Double-Bilayer Graphene, A. Perali, D. Neilson and A. R. Hamilton, Phys. Rev. Letters 110, 146803 (2013)

  26. Quantum Glass Transition at Finite Temperature in Two-Dimensional Electron Layers, David Neilson, Alexander R. Hamilton and Jagdish S Thakur, Int. J. Mod Phys. B 27, 1347004 (2013)

  27. Proceedings of the International Conference on Strongly Coupled Coulomb Systems 2011, Budapest, Hungary, Zolt'an Donk'o, Peter Hartmann and David Neilson (eds.) , Contrib. Plasma Physics 52, 6 (2012)

  28. Dissipative processes in low density strongly interacting 2D electron systems, D. Neilson, chapter 9 in bookCondensed Matter Theories Vol. 25, ed. Eduardo V Ludena, Raymond F Bishop and Peter Iza,  (World Scientific, Singapore, 2011)

  29. Anomalous transport in mesoscopic inhomogeneous two-dimensional electron systems at low temperature,D. Neilson and A.R. Hamilton, Phys. Rev. B15 82, 035310 (2010)

  30. Dissipative processes in low density strongly interacting 2D electron systems, D. Neilson, Int. J. Mod. Phys. B 24, 4946-4960(2010)

  31. Metal-insulator transition in 2D as a quantum phase transition, D.J.W. Geldart and D. Neilson, J. Phys. A 42, 214011 (2009)

  32. Quantum tunnelling and hopping between metallic domains in disordered two-dimensional mesoscopic electron systems, D.Neilson and A.R. Hamilton, J. Phys. A 42, 214012 (2009)

  33. Tunneling and Hopping Between Domains in the Metal-Insulator Transition in Two- Dimensions, David Neilson and Alex Hamilton,Int. J. Mod. Phys. 22, 4565 - 4571 (2008)

  34. Special issue on new developments in strongly coupled Coulomb systems, David Neilson and Gaetano Senatore, J. Phys. A Math.Theor. 42, 210301 (2009)

  35. Quantum critical point description of the 2D metal insulator transition, D.J.W. Geldart and D. Neilson, Physica E: Low-dimensional Systems and Nanostructures, 40, 1182 (2008)

  36. Metal-Insulator Phenomena in 2D: A Unified Scaling Picture, D. Neilson and D.J.W. Geldart, chapter 11 in book, CondensedMatter Theories Vol. 21, edited by Hisazumi Akai, Hiroshi Toki and F. Bary Malik (Nova, New York 2007)

  37. Quantum critical behavior in insulating region of the 2D metal insulator transition, D.J.W. Geldart and D. Neilson, Phys. Rev.B15 76, 193304 (2007)

  38. Electron Gas In High-Field Nanoscopic Transport: Metallic Carbon Nanotubes, F. Green and D. Neilson, Int. J. Mod.Physics B 21, 2181 - 2190 (2007)

  39. Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers, P. Pieri, D. Neilson, and G.C. Strinati, Phys. Rev. B 75, 113301 (2007)

  40. Temperature dependent resistivity in the low resistance region for diffusive transport in two-dimensions, D.J.W. Geldart andD. Neilson, Phys. Rev. B 70, 235336 (2004)

  41. Two-component scaling near the metal-insulator bifurcation in two dimensions, D.J.W. Geldart and D. Neilson, Phys. Rev. B 67, 205309 (2003)

  42. Density dependence of critical magnetic fields at the metal-insulator bifurcation in two dimensions, D.J.W. Geldart and D.Neilson, Phys. Rev. B 67, 045310 (2003)

  43. Characterizing the metal-insulator transitions in 2D, D. Neilson, J.S. Thakur and E. Tosatti, Aust. J. Phys. 53, 531 (2000)

  44. The effect of spin alignment on the metal-insulator transition in two-dimensional systems, J.S. Thakur and D. Neilson, J. Phys. Cond. Matt. 12, 4483 (2000)

  45. Phase diagram of the metal-insulator transition in two-dimensional electronic systems, J.S. Thakur and D. Neilson,Phys. Rev. B Rapid Comm. 59, R5280 (1999)

  46. Metal-insulator transition in a disordered 2D electron gas including temperature effects, J.S. Thakur, Lerwen Liu and D.Neilson, Phys. Rev. B 59, R7255-7258 (1999)

  47. Superconductivity in a correlated disordered two-dimensional electron gas,  J.S. Thakur and D. Neilson, Phys. Rev. B 58, 13717-13720 (1998)

  48. Finite Temperature Correlations on Plasmon and Coulomb Drag in Coupled Quantum Wells, Lerwen Liu, D. Neilson and L.Swierkowski, Physica B 249-251, 937-940 (1998)

  49. Exciton and Charge Density Wave Formation in Spatially Separated Electron Hole Liquids, Lerwen Liu, L. Swierkowski and D.Neilson, Physica B 249-251, 594-597 (1998)

  50. Superconducting pairing in coupled electron-hole layers, J.S. Thakur, D. Neilson and M.P. Das, Phys. Rev. B 57,1801-1804, (1998)

  51. Freezing of Strongly correlated Electrons in Bilayer Systems with Weak Disorder, J.S. Thakur and D. Neilson, Prog. Theor.Phys. 126, 339 (1997)

  52. Electron correlations in thin disordered quantum wires, J.S. Thakur and D. Neilson, Phys. Rev. B 56, 4679 (1997)

  53. Coupled electron and hole quantum wires, J.S. Thakur and D. Neilson, Phys. Rev. B 56, 4671 (1997)

  54. Electron correlations and disorder on mobility and localization in quasi one-dimensional wires,  J.S. Thakur and D. Neilson, Phys. Rev. B 56, 7485 (1997)

  55. Freezing of strongly correlated electrons in bilayer systems with weak disorder, J.S. Thakur and D. Neilson, Phys. Rev. B56, 10297-10302 (1997)

  56. Frozen electron solid in the presence of small concentrations of defects, J.S. Thakur and D. Neilson, Phys. Rev. B 54,7674-7677 (1996)

  57. Static and dynamic properties of coupled electron-electron and electron-hole layers, Lerwen Liu, L. Swierkowski, D.Neilson and J. Szymanski, Phys. Rev. B 53, 7923-7931 (1996)

  58. Correlations in coupled layers of electrons and holes, (with J. Szymanski and L. Swierkowski),  Phys. Rev. B 50, 11002 (1994)

  59. Excitations of the strongly correlated electron liquid in coupled layers, (with L. Swierkowski, J. Szymanski and L. Liu),  Phys. Rev. Lett. 71, 4035 - 4038 (1993)

  60. Spin correlations in the low density electron system, (with F. Green, L.Swierkowski, J. Szymanski and D.J.W.Geldart),  Phys. Rev.  B  47, 4187 - 4192  (1993)

  61. Electron Liquids in Coupled Quantum Wells, (with L. Swierkowski and J. Szymanski),  Acta Phys. Pol. 43, (1993)

  62. Nonlocal exchange contribution to the Free Energy of inhomogeneous many-Fermion systems.  III.  Numerical study for screened Coulomb interaction,  (with M.R.A. Shegelski,  D.J.W. Geldart and M.L. Glasser),  Can. J. Phys. 72, (1993)

  63. Collective modes in the two-dimensional electron liquid near the Wigner phase transition, (with L. Swierkowski, J.  Szymanski and L. Liu)  J. Low Temp. Phys.  89, 251 - 256 (1992)

  64. Positron Surface Sticking Rates,  (with A.B. Walker, J. Szymanski and K.O. Jensen),  Phys. Rev. A  46, 1687 - 1696  (1992)

  65. Enhancement of Wigner Crystallization in Multiple-Quantum-Well Structures, (with L. Swierkowski and J. Szymanski),  Phys. Rev. Lett. 67, 240 - 243 (1991)

  66. Dynamical Theory for Strongly Correlated Two Dimensional Electron Systems, (with A. Sjolander, L. Swierkowski and J.  Szymanski), Phys.  Rev. B  44, 6291 - 6305 (1991)

  67. Adsorption of Zinc on Cadmium Telluride and Mercury Telluride Surfaces, (with K.A.I.L.  Wijewardena J. Szymanski), Phys. Rev. B  44, 6344 - 6350 (1991)

  68. New Quantum Interference Effect in Rotating Systems,  (with C. H. Tsai),  Phys. Rev. A  37, 619--621 (1988)

  69. Angular Distribution of Positrons Emitted from Metal Surfaces, (with R.M. Nieminen and J. Szymanski),  Phys. Rev B 38, 11131-11134 (1988)

  70. Surface Barrier Effects in Low Energy Positron Diffraction,  (with P.J.  Jennings),  Solid State Comm.  65, 649--652 (1988)

  71. Energy Loss Mechanism for Hot Electrons in GaAs,  (with D.X. Lu and J. Szymanski),  J. de Physique  48, 263--266 (1987)

  72. Electron and Hole Self Energy Contributions to the Dynamic Structure Factor in Interacting Electron Systems, (with F. Green and J. Szymanski),  Phys. Rev. B  35, 124 - 132 (1987)

  73. Multipair Excitations and Sum Rules in Interacting Electron Systems, (with F.  Green, D. Pines and J. Szymanski),  Phys. Rev.  B  35, 133--144 (1987)

  74. Adsorption on Narrow Gap Semiconductors,  (with H.J. Kreuzer and J.Szymanski),  Phys. Rev. A  36, 3294 - 3303 (1987)

  75. Phonon Emission by a Hot Two Dimensional Electron Gas in a Quantizing Magnetic Field  (with G.A. Toombs, F.W. Sheard and L.J. Challis), Sol. State Comm.  64, 577 - 581 (1987)

  76. Emission of Thermal Positrons from Metal Surfaces,  (with R.M. Nieminen and J.  Szymanski),  Phys. Rev. A  33, 1567 - 1571 (1986)

  77. Dynamical Theory of Binary Ionic Mixtures,  (with K.I. Golden and F.Green),  Phys. Rev. A,  Rapid Comm.  31, 3529 3532 (1985)

  78. Functional Dependence of Electron Mobility on  Distance of Remote Donor Impurities from the Interface in AlGaAs/GaAs Heterostructures, (with J. Szymanski, F.  Green, P.G. Kemeny and B.J. Linard),  App. Surf. Sci.  22, 992--996 (1985)

  79. First Principles Calculation of the Dynamic Structure Factor for the Electron Gas in Metallic Systems,  (with F. Green and J. Szymanski), Phys. Rev. B  31, 5837 - 5840 (1985)

  80. Nonlinear Response Function Approach to Binary Ionic Mixtures: Dynamical Theory, (with K.I.  Golden and F. Green),  Phys. Rev. A 32, 1669 - 1692 (1985)

  81. Bound Electron States of Coulombic Impurities and their Effect on Mobility in Inversion Layers,  (with F. Green and J. Szymanski), Surf. Sci.  142, 279 - 283 (1984)

  82. A Conserving Dynamic Theory for the Electron Gas,  (with F. Green and J. Szymanski),  Phys. Rev B  31, 2779 - 2795 (1985)

  83. The Dynamic Structure Factor for the Electron Gas in Metallic Systems, (with F. Green and J. Szymanski),  Phys. Rev B  31, 2796 - 2815 (1985)

  84. Momentum Dependent Annihilation Rate for Positrons in Metals, Phys. Rev. B  26, 60 - 65 (1982)

  85. Direct Evidence for Dynamic Electron Electron Correlations in Metals, (with F. Green and J. Szymanski),  Phys.  Rev. Lett. 48, 638--641 (1982)

  86. Photodesorption of Diatomic Molecules by Laser - Molecular Vibrational Coupling, (with H.J. Kreuzer),  Chem. Phys. Letters  78, 50 -53 (1981)

  87. Rate Equations for Positronium Formation at Metal Surfaces, (with H.J.  Kreuzer and Z.W. Gortel),  Solid State Comm.  35, 781 -784 (1981)

  88. On the Validity of a Hydrodynamic Description of Laser - Driven Fusion,  (with H.J. Kreuzer),  J. Plasma Physics  23, 357 -381 (1981)

  89. Study of the Electronic Structure of Model (110) Surfaces and Interfaces of Semi-Infinite III-V CompoundSemiconductors:  The GaSb--InAs System,  (with N.V. Dandekar and A. Madhukar),  Phys. Rev. B  21, 5687 - 5705 (1980)

  90. Enhancement of Positron Annihilation with Core Electrons in Solids, (with E. Bonderup and J.U. Andersen),  Phys. Rev. B  20, 883 -899 (1979)

  91. Study of Interface Electronic Structure of a Model Metal-Semiconductor Interface,  (with A. Madhukar),  Phys. Rev. B  17, 3832 -3843 (1978)

  92. Solidification of Helium-4 Monolayer, (with M.A. Lee and C.W. Woo), Phys. Rev. B  14, 4874 - 4882 (1976)

  93. New Variational Treatment of the Ground State of Solid Helium, (with C.W. Woo), Phys. Rev. B  13, 3790 - 3798 (1976)

  94. Theory of Quantum Crystals,  (with C.W.  Woo),  Phys. Lett. 56A, 402 - 404 (1976)

  95. Caging and the Solidification of Neutron Star Matter,  (with C.W. Woo),  Phys. Rev.  D  13, 3201 - 3207 (1976)

  96.       Electron Correlations at Metallic Densities,  (with G.E. Brown),  Phys.  Rev. B  12, 2138 - 2149 (1975)

  97.       Positron Annihilation and Electron Correlations in Metals, (with A.D. Jackson), Phys. Rev. B  12, 1689 - 1706 (1975)

  98.       Single-Electron Energies, Many Electron Effects, and the Renormalized Atom Scheme as Applied to Rare-Earth Metals, (with J.F. Herbst and R.E. Watson), Phys. Rev. B 6, 1913 - 1924 (1972)

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