THEME01-3-1072-2009/2013

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01-3-1072-2009/2013

Priority:

Status:

Approved for completion
in 2013

Theory of Condensed Matter and New Materials

Leaders:	V.A. Osipov J. Brankov
Scientific leader:	N.M. Plakida

Participating Countries, Institutes and International organizations:
Armenia, Australia, Belarus, Belgium, Brazil, Bulgaria, Canada, Czech Republic, France, Germany, Hungary, India, Ireland, Italy, Moldova, Mongolia, Poland, Romania, Russia, Serbia, Slovak Republic, Slovenia, Spain, Switzerland, Taiwan, Ukraine, USA, Uzbekistan, Vietnam.
Scientific Programme:
Multiparticle 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 a 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 µSR method will be used.
   Nonlinear problems in multiparticle 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 common properties of the multiparticle 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 to describe 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 2013:

Calculation of the superconducting transition temperature in the extended Hubbard model by taking into account the inter-site Coulomb repulsion and electron-phonon interaction.

Study of the magnetic reorientation in sandwich structures of magnetic thin films within the Green function theory. Description of the process of coherent spin reversal in magnetic nanomaterials and estimation of the optimal conditions for ultrafast reversal.

Calculation of the orbital excitations in vanadium perovskites and their manifestation in the resonant inelastic X-ray scattering spectra.

Study of small-angle neutron scattering from multiphase fractal systems.

Proof of instability of Nagaoka state towards the creation of the antiferromagnetic bubble via a first order phase transition, including a jump in the total spin.

Investigation of the influence of microwave radiation on the current-voltage characteristics of intrinsic Josephson junctions and temporal oscillations of the electric charge in superconducting layers.

Investigation of electron and heat transport through single and few-layer graphene contacts.

Description of the process of generation of quantum turbulence in bose-condensed systems of trapped atoms. Proposal of experiments on the detection of granular states in such systems.
Evaluation of correlation functions of the Totally Asymmetric Simple Exclusion Process with the generalized update.

Studies of asymptotic properties of the loop erased random walk.

Application of the obtained asymptotics to calculation of new characteristics for Rise and Peel model: the distributions of clusters, length of connection and density of vertices.

Derivation of the exponent characterizing the growth of the number of n-leg watermelons in the two-dimensional spanning tree.

Finding a new type of boundary conditions for two-dimensional lattice spin systems which preserve the condition of integrability, and to solving the corresponding Yang-Baxter equation.

Explicit construction of the Cartan calculi on the quantum groups of series SLq(n) and SU_q(n), and to investigation of their structure theory and applications to integrable systems.

List of Activities
	Activity or experiment	Leader
	Laboratory or other Division of JINR	Main researchers
1.	Physical properties of complex materials and nanostructures	N.M. Plakida V.A. Osipov G. Ropke
	BLTP	J. Brankov, A.Yu. Cherny, A.V. Chizhov, V. Ilkovich, V.L. Katkov, O.G. Isaeva, W. Kleinig, E.A. Kochetov, D.V. Kolesnikov, S.E. Krasavin, A.L. Kuzemsky, V.A. Moskalenko, V.N. Plechko, J. Schmelzer, V.Yu. Yushankhai + 3 students


2.	Mathematical problems of many-particle systems	V.B. Priezzhev V.I. Yukalov
		V.M. Dubovik, V.I. Inozemtsev, T.A. Ivanova, A.E. Patrik, A.M. Povolotsky, P.N. Pyatov, V.P. Spiridonov, P.E. Zhidkov + 2 students
	FLNP	V.L. Aksenov, A.M. Balagurov

Collaboration
Country or International Organization	City	Institute or Laboratory
Armenia	Yerevan	ANL
		YSU
Australia	Melbourne	Univ.
	Sydney	Univ.
Belarus	Minsk	IP NASB
		ICE MES RB
		JIMB NASB
		JIPNR-Sosny NASB
Belgium	Louvain-la-Neuve	UCL
Brazil	Brasilia, DF	UnB
	Sao Paulo, SP	USP
	Natal, RN	IIP UFRN
Bulgaria	Sofia	IMech BAS
		ISSP BAS
		SU
		INRNE BAS
Canada	Montreal	Concordia
	Quebec	ULaval
	Kingston	Queen's
	London	Western
Czech Republic	Rz{NPI ASCR	tab{France
	Marseille	UPC
	Nice	UN
	Valenciennes	UVHC
Germany	Bonn	UniBonn
	Bremen	Univ.
	Braunschweig	TU
	Dortmund	TU Dortmund
	Darmstadt	GSI
	Dresden	IFW
		MPI PkS
		TU Dresden
	Duisburg	UDE
	Leipzig	UoC
	Magdeburg	OVGU
	Rostock	Univ.
	Stuttgart	MPI-FKF
	Wuppertal	Univ.
Hungary	Budapest	Wigner RCP
India	Mumbai	TIFR
Ireland	Dublin	DIAS
Italy	Catania	UniCT
	Salerno	UniSa
Poland	Krakow	JU
	Warsaw	IPCh PAS
		WUT
	Katowice	US
	Poznan	AMU
		IMP PAS
Romania	Bucharest	IFIN-HH
	Timic soara	UVT
Russia	Moscow	MGTU MIREA
		NNRU "MEPhI"
		MSU
		PFUR
		SINP MSU
		MI RAS
		NRC KI
	Moscow, Troitsk	HPPI RAS
		INR RAS
	Belgorod	NRU BelSU
	Dubna	BMSUT MIREA
	Gatchina	PNPI
	Kazan	KFU
	Protvino	IHEP
	Saratov	SSU
	St. Petersburg	ETU
		IPTI RAS
		SPbSU
	Voronezh	VSU
Moldova	Chisinau	IAP ASM
Mongolia	Ulaanbaatar	NUM
Serbia	Belgrade	INS "VINC"
Slovak Republic	Bratislava	IP SAS
	Kosice	IEP SAS
		TUKE
Slovenia	Ljubljana	UL
Spain	Madrid	ICMM
Switzerland	Villigen	PSI
	Zurich	ETH
Taiwan	Taipei	IP AS
Ukraine	Kharkov	KFTI NASU
	Kiev	IMP NASU
		NUK
	L'viv	ICMP NASU
USA	Louisville, KY	UofL
	New York, NY	CUNY
	Rochester, NY	UR
	Tallahassee, FL	FSU
Uzbekistan	Tashkent	Assoc."P.-S." PTI
Vietnam	Hanoi	IMS VAST

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