THEME01-3-1115-2014/2018

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01-3-1115-2014/2018

Priority:

Status:

In-progress

Theory of Condensed Matter

Leaders:

V.A. Osipov
A.M. Povolotskii

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, Slovakia, Slovenia, Spain, Switzerland, Taiwan, Ukraine, USA, Uzbekistan, Vietnam.
Scientific Programme:
Effects of strong electron correlations in high-temperature superconductors, colossal magneto-resistance compounds (manganites), heavy-fermion systems, low-dimensional quantum magnets with strong spin-orbit interaction, topological insulators, etc. will be investigated based on a variety of underlying many-band electronic models including the extended Hubbard model, Anderson model, super-exchange spin-orbital models of transition of metal oxides with strong relativistic spin-orbital coupling. The electronic band structure, spectral properties of charge carrier quasiparticles, magnetic and charge collective excitations, metal-insulator and magnetic phase transitions, Cu- and Fe-based high-Tc superconductivity, charge and spin-orbital ordering will be studied. The obtained results will be used to support neutron scattering experiments performed at FLNP, JINR.
Investigations in the field of nanostructures and nanoscaled phenomena will be addressed to a study of physical characteristics of nanomaterials promising for various applications in modern nanotechnologies. The electronic, thermal and transport properties of carbon nanostructures will be investigated. It is planned to study the problem of quantum transport in molecular devices. Spin dynamics of magnetic nanoclusters will be investigated. The analysis of resonance tunneling phenomena in the layered superconductors and superconducting nanostructures in the external fields will be performed. Numerical modeling of resonance, radiative and chaotic properties of intrinsic Josephson junctions in high temperature superconductors is planned to be carried out.
Мodels in condensed matter physics will be studied by using methods of equilibrium and non-equilibrium statistical mechanics with the aim of revealing general properties of many-particle systems based on the ideas of self-similarity and universality. Mathematical mechanisms, underlying the kinetic and stationary behavior of model systems, as well as possible links between different models, will be investigated. The study of two-dimensional lattice models by the transfer matrix method will be focused on confirming the predictions of the logarithmic conformal field theory. The theory of integrable systems will be developed in the aspect of finding new integrable boundary conditions for two-dimensional spin systems and the solution of the corresponding Yang-Baxter equations. The universal behavior of correlation functions in non-equilibrium systems will be studied as well. The research in the structure theory and the theory of representations of quantum groups and matrix algebras will be directed to further applications in the theory of integrable models in quantum mechanics and statistical physics. Applications of the elliptic hypergeometric integrals, defining the most general solutions of the Yang-Baxter equation and most complicated known exactly computable path integrals in four-dimensional quantum field theory, to two-dimensional spin systems will be studied.

Expected main results in 2016:

Investigations of magnetic phase transitions in anisotropic antiferromagnets within the compass-Heisenberg and Kitaev-Heisenberg models.

Study of the lattice Kondo-Heisenberg model in the strong coupling limit to describe the pseudogap phase of the underdoped cuprates.

Investigation of the electro and thermal conductivity of graphene and graphene nanoribbons with different types of defects .

Estimation of the intensity of electromagnetic radiation from coupled system of Josephson junctions in parametric resonance region.

Study of small-angle neutron scattering from fractal structures which show both mass and surface fractal regions.

Analytic and numerical investigation of nonequilibrium Bose gases of cold atoms.
Application of the coordinate Bethe ansatz to higher spin stochastic vertex models. Investigation of the statistics of large deviations in conformally invariant stochastic models.

Generalization of the theorem about loop covering in the rotor-router model for the case of loops with holes. Investigation of spiral structure of a random walk in the rotor-router model.

Derivation of new formulas for zonal spherical functions on symmetric spaces of negative curvature of the class A II.

Study of scattering of instantons in Yang-Mills theory with the help of the adiabatic approach.

Derivation of finite-dimensional solutions of the Yang-Baxter equation by reduction of the general integral R-operator with rank 1 symmetry algebra. Investigation of two-dimensional integrable spin systems with the mixed discrete and continuous spin variables.

List of Activities
	Activity or Experiment	Leaders
	Laboratory or other Division of JINR	Main researchers

Complex materials
and nanostructures

V.A. Osipov
N.M. Plakida

	BLTP	E.M. Anitas, A.Yu. Cherny, A.V. Chizhov, V. Ilkovich, O.G. Isaeva, V.L. Katkov, E.A. Kochetov, D.V. Kolesnikov, S.E. Krasavin, D.A. Lobanov, M. Maiti, A.N. Novikov, V.N. Plechko, I.R. Rahmonov, J. Schmelzer, Yu.M. Shukrinov, M.A. Smondyrev, J. Smotlacha, A.A. Vladimirov, V.Yu. Yushankhai
	FLNP	V.L. Aksenov, A.M. Balagurov, A.I. Kuklin
	LIT	E.B. Zemlianaya, I. Sarhadov, S.I. Serdyukova, L.A. Syurakshina

Contemporary problems
of statistical physics

A.M. Povolotsky
V.B. Priezzhev

	BLTP	J. Brankov, N.Zh. Bunzarova, V.M. Dubovik, V.I. Inozemtsev, A.L. Kuzemsky, T.A. Ivanova, V. Papoyan, A.E. Patrik, P.N. Pyatov, V.P. Spiridonov, O. Turek, V.I. Yukalov, P.E. Zhidkov
	LIT	E.P. Yukalova

Collaboration
Country or International Organization	City	Institute or Laboratory
Armenia	Yerevan	Foundation ANSL
		YSU
		IIAP NAS RA
Australia	Melbourne	Univ.
	Sydney	Univ.
Belarus	Minsk	BSTU
		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	UL
	Kingston	Queen's
	London	Western
Czech Republic	Rez	NPI ASCR
France	Paris	UPMC
	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	IPC PAS
		WUT
	Katowice	US
	Poznan	AMU
		IMP PAS
Romania	Bucharest	IFIN-HH
	Cluj-Napoca	UTC-N
	Timisoara	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 "VINCA"
Slovakia	Bratislava	CU
	Kosice	IEP SAS
		TUKE
Slovenia	Ljubljana	UL
Spain	Madrid	ICMM-CSIC
Switzerland	Villigen	PSI
	Zurich	ETH
Taiwan	Taipei	IP AS
Ukraine	Kharkov	KFTI
	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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