

Research Interests
My research
work is in the general area of theoretical condensed matter physics.
Condensed matter physics has a goal of understanding the structure and
properties of all kinds of solids and liquids. It is a very broad and
lively area of research, where one witnesses frequent occurrence of novel
phenomena relating to exotic properties of matter in semiconductors, superconductors,
magnets etc. Due to intense research all over the world in this area,
new ideas and novel materials are created. Needless to say, today Condensed
matter physics is one of the main pillars of high technology.
In this
highly active area my research interest is concerning the fundamental
aspects of condensed matter, which include
Mesoscopic
Systems (Electronic Transport and Noise) 
High
Temperature Superconductivity 
Strongly
Correlated Electronic Systems 
Density
Functional Theory of Vortex Matter 
BoseEinstein
Condensation 
Theory
of Disordered States 
Some
highlights of our recent work:
 High
Tc superconductivity and vortex matter phase transition.
In the bulk
high Tc superconductors (HTcS) the critical current in presence of a magnetic
field is lower by an order of magnitude compared with that of low Tc superconductors.
The low critical current is due to weak pinning of the vortices in the
mixed phase. At high magnetic field and at high temparature, the vortex
lattice seems to melt to a vortex liquid state causing dissipation. We
have developed a first principle density functional theory of vortex matter.
In this theory the freezing temperature of the vortex liquid is calculated
for various applied magnetic fields, thus generating the freezing phase
boundary. Our results are analysed in relation to experimental data. We
also found that there exists a " vortex gas phase" above the
first critical field below Tc.. Thus we predict a reentract phase which
is now verified in resistivity and magnetisation experiments.
 Strongly
Correlated Systems
Strong electronic
correlations seem to influence the physical properties of solids resulting
in peculiar anomalies. By using the slave boson formalism in a Hubbard
model we have studied metalinsulator transition and have analysed as
a function of doping the competition between a charge density wave phase
induced by oxygen breathing modes, antiferromagnetic order and paramagnetism.
Our analyses explain a number of qualitative features observed in the
normal states of the underdoped phase of the oxide superconductors. In
this work we have emphasised the role of phonons in the strong correlation
models. We have also studied zinc doping in place of copper in CuO2 planes.
Our theory revels formation of local moments near the impurity sites.
 Electronic
Transport and Noise in Mesoscopic Degenerate Systems
In earlier
days noise was considered as unwanted. Currently it is viewed as a phenomenon
that carries important information about a physical system. During the
past five years we have been studying mesoscopic transport and noise.
Our methods are technically rigorous and manifestly consistent with all
relevant physical constraints. Surprisingly, other well established theories
are in conflict with ours, despite their widespread adoption over recent
years. The clear implication is that these established accounts of noise
are at odds with basic principles.
In a series
of recent published critiques we have identified how these violations
occur. We have shown that the models in question are liable to need deep
revision, to regain any credibility as eventual platforms for practical
device engineering. The wider significance of our work puts it in a field
in which the interplay of open boundary conditions (imposed from outside)
and of the microscopic dynamics (within the system) demands careful treatment.
The key ingredients of our work involves interparticle correlations via
the Landau's Fermi liquid theory, an aspect generally ignored in the popular
literature.
Selected recent publications
:
 CONDENSED
MATTER THEORIES,VOL.17, (with F. Green) Edited, Nova Sc, New York (2003)
pp. 387.
 Mesoscopic
transport as manybody physics (with F. Green) in Condensed Matter Theories,Vol.17,
Ed. M. P. Das and F. Green, Nova Sc, New York (2003) 83102.
 Excitonic
Superconductivity in Charge Injected Organics (with F. Green) Nonlinear
Optics (2002) to appear
 Transport
and noise in mesoscopic conductors: A conservative view (with F. Green)
in Noise and Fluctuations Control in Electronic Devices, Ed. A. Balandin,
Am Scientific Publ., USA (2002).
 Dynamical
theory of strongly coupled twodimensional Coulomb fluids in the weakly
degenerate quantum domain (with K. I. Golden and F. Green), Phys Rev
E 64 (2001) 046125 113.
 Classical
to quantum crossover in highcurrent noise of onedimensional ballistic
wires (with F. Green), Fluctuation and Noise Lett. 1 (2001) C21C33.
 Aspects
of transport and noise for mesoscopic charge detectors (with F. Green)
in
Experimental Implementation of Quantum Computation (IQC'01) Ed. R. Clark,
Rinton Press , Princeton,USA (2001) 335339.
 Shot
noise in mesoscopic quantum systems (with F. Green) in Condensed Matter
Theories,Vol.16, Ed. S. Hernandez and J. Clark, Nova Sc, New York (2001)
2939.
 Shot
noise in fractional quantum Hall systems (with F. Green) in Science
and Technology of Nanostructured Materials, Editors. B. K. Rao, S. M.
Bose, M. P. Das, and S. N. Sahu, Nova Scientific , New York (2001) 217222.
 SCIENCE
AND TECHNOLOGY OF NANOSTRUCTURE MATERIALS, (with B. K. Rao, S. M. Bose,
and S. N. Sahu), Edited. Nova Scientific, New York (2001).
 Compressibility
sum rule for the two dimensional electron gas (with K. I. Golden and
F. Green, Phys. Rev. E 64 (2001) 012103,1
 On the
'anomalous' resurgence of shot noise in long conductors (with F. Green)
Australian J. Physics 53 (2000)499512.
 Comments
on ' Conductance and shot noise for particles with exclusion statistics'
by Isakov, Martin and Ouvry (with F. Green), Phys. Rev. Lett. 85 (2000)
222.
 Coulomb
screening in mesoscopic noise: a kinetic approach (with F. Green) J.
Phys. Cond.Mat. 12 (2000) 52515273. (condmat/9911251)
 High
field noise in metallic diffusive conductors (with F. Green) J. Phys.
Cond.Mat. 12 (2000) 52335250.(condmat/9809339).
 Kinetic
approach to mesoscopic noise (with F. Green) in Condensed Matter Theories
Vol 15, Editors G. S. Anagnostatos, R. F. Bishop, K. A. Gernoth, J.
Ginis and A. Theophilou , Nova Science, New York (2000) 403414.
 BoseEinstein
condensation of atoms with attractive interaction in a harmonic trap
( with N. Akhmediev and A. Vagov) Australian J. Phys. 53 (2000) 157165.
 Mesoscopic
Noise Theory: Microscopics or Phenomenology? (with F. Green) in Unsolved
Problems of Noise and Fluctuations, Editors D. Abbott and L. B. Kish,
American Institute of Physics, 511 (2000) 422433.
 CONDENSED
MATTER IN ZERO, ONE AND TWO DIMENSIONS (with D.Neilson) Edited,Proceedings
of 9th Gordon Godfrey Workshop on Condensed Matter Physics : CSIRO Publishing,
Melbourne (2000).
 BOSEEINSTEIN
CONDENSATION: atomic physics to quantum liquids (with C. Savage) Edited,
Proceedings of 13th Physics Summer School : World Scientific Publ.,
Singapore (2000) .This is also published as a Supplementary Issue of
'The Modern Physics Letters B' Sept, 2000.
 NANOSTRUCTURES
AND QUANTUM CONFINEMENTS
Proceedings of Workshop (Edited) held in the Australian National University,
Nov Dec (1998)
Special Issue of Australian J. Physics , 53, No.1 (2000).
 Normal
state anomalies in high Tc superconductors
Proc. Third Rencontres du Vietnam, Superconductivity, MagnetoResistive
Materials and Strongly Correlated Quantum Systems, Editors Nguyen Van
Hieu, Tran Thanh Van and Gang Xiao (Vietnam National Univ Press, Hanoi)
(1999) 5153.
 Mesoscopic
Noise Theory: Microscopics, or Phenomenology? ( with F. Green) Proc.
2nd International Conference on Unsolved Problems of Noise, Editors:
D. Abbott and L. B. Kiss, Adelaide, (AIP).(condmat/ 9905086)
 PHYSICS
OF NOVEL MATERIALS, Proceedings of Tenth Physics Summer School (Edited)
World Scientific Publ.,Singapore (1999).
 BoseEinstein
condensation of atoms with attractive interaction (with N. Akhmediev
and A. Vagov) International J. Modern Physics, B 13 (1999) 625631.
 Density
Functional Theory of SuperPhenomena in Condensed Matter Theorie Vol
14, Editor D. Ernst, Nova Science, New York (1999) 97103.
 FUTURE
DIRECTIONS FOR CONDENSED MATTER PHYSICS (with D. Neilson) Proceedings
of 8th Gordon Godfrey Workshop on Condensed Matter Physics (Edited)
:CSIRO Publishing, Melbourne (1999).
 Novel
superconducting mechanism in coupled electronhole layers (with J. S.
Thakur and D. Neilson) Physical Review B 57 (1998) 18011804.
 Some
ground state properties of 3d and 4d metals studied using the generalised
gradient approximation ( with K. Kokko) J. Phys. Condens Matter 10 (1998)
12851291.
 Effect
of Cu site Co,Ni and Ga substitution on the superconductivity of tetragonal
LaBaCaCu3O7 system (with V. P. S. Awana, J. Horvat, H.K.Liu, S.X.Dou,
R. Singh and A.V. Narlikar) PhysicaC 301 (1998) 205214.
 Local
moment formation in zincdoped cuprates ( with B. C. den Hertog) Phys.
Rev.B 58 (1998) 28382843.
 ELECTRONIC
DENSITY FUNCTIONAL THEORY: Recent Progress and New Directions (Edited
with J. F. Dobson and G. Vignale) Plenum Press, New York (1998).
 Brief
Introduction to Density Functional Theory in Electronic Density Functional
Theory. Editors J. F. Dobson, G. Vignale and M. P. Das, Plenum Press,
New York (1998) 318.
 Density
Functional Theory of SuperPhenomena in Condensed Systems in Electronic
Density Functional Theory. Editors J. F. Dobson, G. Vignale and M. P.
Das, Plenum Press, New York (1998) 373378.
 Ground
State Properties of 3d and 4d Metals: A Study via GGA Made Simple (
with K. Kokko) in Novel Materials Design and Properties, Editors B.
K. Rao and S. N. Behera. Nova Science Publ. (1998) 405410.
 BoseEinstein
condensation of trapped alkali atoms with attractive interaction ( with
N.Akhmediev and A. Vagov) Proc. IX International Conference on Recent
Progress in Many Body Theories, Editors: D. Neilson and R.F.Bishop,
World Scientific, Singapore,(1998) 287292.
 High
field fluctuations in mesoscopic metals (with F. Green) Proc. IX International
Conference on Recent Progress in ManyBody Theories, Editors: D. Neilson
and R.F.Bishop, World Scientific, Singapore, (1998) 102105.
 Stability
of the pancake vortex lattice in a twolayered superconductor (with
D. J. C. Jackson) Condensed Matter Theories Vol 13, Editors J. da Providencia
and F. B. Malik, Nova Science, New York (1998) 287294.
 Electron
ejection from clean metallic surfaces upon charged particle impact (
with J. Berakdar) Physical Review A 56 (1997)14031413
 Zinc
valency and local moments in impurity doped cuprates (with B. C. den
Hertog) Physica C 282 287 (1997) 17091710.
 BoseEinstein
ondensation of Atoms with Attrcative Interaction (with N. Akhmediev
and A. Vagov) in Condensed Matter Theories Vol 12, Editors J. W. Clark
and P. V. Panat, Nova Science, New York (1997) 1726.
 Slave
Boson treatment of metalinsulator transition in CuO planes at zero
and finite doping (with B. C. den Hertog) Solid State Comm, 98 (1996)
710.
 A possible
new type of superconductivity (with L. J. Tassie) Modern Phys.Lett.10B
(1996) 173179.
 Normal
state phase of CuO planes in high Tc superconductors ( with B. C. den
Hertog) Physical Review B54 (1996) 66936699.
 Melting
of the flux line lattice: a review (INVITED) ( with D. J. C. Jackson)
Superconductor: Science and Technology (1996) 9, 713727.
 ATOMIC
AND ELECTRON FLUIDS Proceedings of 4th Gordon Godfrey Workshop on Condensed
Matter Physics (Edited with D. Neilson) CSIRO Publishing, Melbourne
(1996).
 Phase
Transition in Vortex Matter (with D. J. C. Jackson) in Condensed Matter
Theories Vol 11, Editors E. Ludena, P. Vashishta and R. F. Bishop,,
Nova Science, New York (1996) 473 482.
 Freezing
of vortex liquid in high temperature superconductors, J. Korean Phys.
Soc. (1996) 29S, 14951.
