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01-3-1030-99/2003   Priority:
Status:
1
In-progress

Theory of Condensed Matter

Leaders:

N. Plakida
V. Priezzhev

Scientific Programme:

Multi-particle models of solids taking into consideration strong electron correlations, electron-lattice and spin interactions to describe spectra of quasiparticle excitations, phase transitions and kinetic phenomena in solids. In equilibrium and nonequilibrium media with strong correlations such as liquids and nuclear matter the processes of multifragmentation, clusterization in phase transitions and the influence of surface effects on properties of clusters. In the theory of superconductivity, nonstandard mechanisms of pairing in metal-oxides, the problem of bipolaron stability in a polaron gas environment, the influence of strong electric fields and temperature gradients on elastic, magnetic, and thermal properties of granular superconductors. For the study of mechanisms of phase transitions caused by charge, orbital, and magnetic ordering in magnetic semiconductors and in metals with a large magnetoresistance, experimental data obtained at the Frank Laboratory of Neutron Physics, JINR, by neutron scattering and the SR method will be used.

Nonlinear problems in multi-particle theory will be studied by using modern methods of the renormalization group theory, the inverse scattering problem, fractal geometry, and the conformal field theory. The main subjects of the study are integrable systems, equilibrium systems of the statistical mechanics and dissipative systems far from the thermodynamic equilibrium. The aim of these investigations is to reveal the common properties of the multi-particle systems associated with the ideas of self-similarity and universality.

The microstructure of amorphous state will be studied in the framework of the theoretical model where topological disorder is introduced via arrays of disclination dipoles and loops. The thermal properties of disclinated media are of primary interest. The electronic spectrum of carbon materials, fullerenes and nanotubes, will be examined within the field-theory model adapted to account for nontrivial geometry of these nanostructures. The model of random Josephson junction arrays will be studied and applied for the description of the high-temperature granular superconductors.

In the theory of finite quantum systems, local and low-dimensional states of matter obtained in modern experiments will be investigated. In particular, properties of quasiparticles in mesoscopic systems and the Bose-Einstein condensation in atomic traps will be studied.

Expected main results in 2001:




List of Activities

  Activity or project Spokespersons Principal researchers
1. Strongly Correlated Systems N. Plakida
G. Repke
  W. Kleinig
A. Kuzemsky
V. Moskalenko
V. Oudovenko
J. Schmelzer
V. Yushankhai
2. Dynamic Systems: chaos,
integrability and self-organization
V. Priezzhev
  L. Alexsandrov
V. Mel'nikov
V. Inozemtsev
T. Ivanova
E. Ivashkevich
A. Povolotskiy
V. Plechko
K. Rerikh
P. Zhidkov
3. Disorded Structures: glasses,
topological defects, nanostructures
and Josephson junction
V. Osipov
  E. Kochetov
S. Krasavin
S. Sergeenkov
4. Mesoscopic and Coherent
Phenomena in Quantum Systems
M. Smondyrev
V. Yarunin
  E. Bukina
A. Cherny
A. Chizhov
V. Dubovik
A. Shanenko
V. Yukalov

Participating Institutes and Organizations

 
Armenia YerPhI (Yrevan)
Azerbaijan IP (Baku)
Belarus IMAP (Minsk)
Belgium UIA (Antwerp)
Brazil Univ. (Brasilia, Sao Paulo)
Bulgaria US, ISSP (Sofia)
Canada CU (Montreal)
Czech Repablic NPI (Rez)
France CNRS (Marseille), Univ. (Nice)
Germany TUD, IFW (Dresden), Univ. (Bremen, Humburg, Leipzig, Rostock),
UNIDO (Dortmund), GMU (Duisburg),TU (Magdeburg), MPIF (Stuttgart),
TUCW (Braunsweig)
Hungary KFKI (Budapest)
ICTP
India TIFR (Bombay)
Ireland DIAS (Dublin)
Italy Univ. (Catania, Salerno)
JINR LHE, FLNP, LIT
Poland UJ (Cracow), IP AMU (Poznan)
Romania INFIN-HH (Bucharest)
Russia KIGICh, LPI, MEPI, SINP MSU, PFUR, SRC RRC KI, SMI (Moscow),
IMP (Ekaterinburg), ISU (Irkutsk), PSU (Perm), VIHPP (Troitsk),
POMI (St. Peterburg), VSU (Voronezh)
Slovak Repablic IP (Bratislava), IEP (Kosice)
Slovenia Univ. (Ljubljana)
Switzerland PSI (Villigen)
Taiwan IP ASN (Taipei)
UK Univ. (Cambrige)
Ukraine NSC KIPT (Kharkov)
USA CUNY (New York), UR (Rochester)
Uzbekistan PTI (Tashkent)
Vietnam IP NCSP (Hanoi)
Yugoslavia INS "Vinca" (Belgrade)

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