THEME01-3-1115-2014/2018

Next theme	Prev. theme
to field of reseach	to contents

01-3-1115-2014/2018

Priority:

Status:

New

Theory of Condensed Matter

Leaders:

V.A. Osipov
J. Brankov

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:
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 extended Hubbard model, Anderson model, super-exchange spin-orbital models of transition 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 in the 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.

Models 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.

Expected main results in 2014:

Calculation of the spin-excitation spectrum and thermodynamic characteristics of the high-temperature Fe-based superconductors within the effective anisotropic J₁ - J₂ model.

Study of the doping dependence of superconducting temperature T_c within the extended Hubbard model in the Mott-Hubbard regime for various values of the single-site U and intersite V_ij Coulomb repulsions.

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

Investigation of nonequilibrium properties of trapped cold atoms. Description of the process of generating quantum turbulence and granular states in Bose-condensed trapped systems.

Study of electron and heat transport through graphene-DNA base-graphene system.

Calculation of the density of electronic states in armchair and zig-zag graphene nanoribbons containing topological defects and domain walls.

Investigation of the influence of resonance and tunneling phenomena on radiation of electromagnetic waves in terahertz region in the layered superconductors and superconducting nanostructures in external fields.

Development of a theory for correct description of finite quantum systems with applications to magnetic molecules and nanoclusters.
Investigation of the conditions of integrability of the fragmentation processes with factorized steady state.

Study of the stationary state of an integrable model of the attractive traffic on the lattice with periodic boundary conditions.

Investigation of the properties of the elliptic modular double and its applications to integrable models of statistical mechanics.

Construction of Yang-Mills instantons on the conifold and a study of their properties.

Explicit implementation of renormalization group transformations in the 3D spherical model.

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, 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

Contemporary problems
of statistical physics

J. Brankov
V.B. Priezzhev

BLTP

N.Zh. Bunzarova, V.M. Dubovik, V.I. Inozemtsev, T.A. Ivanova, A.L. Kuzemsky, V. Papoyan, A.E. Patrik, A.M. Povolotsky, P.N. Pyatov, V.P. Spiridonov, V.I. Yukalov, P.E. Zhidkov

FLNP

V.L. Aksenov, A.M. Balagurov, A.I. Kuklin

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	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	IPCh PAS
		WUT
	Katowice	US
	Poznan	AMU
		IMP PAS
Romania	Bucharest	IFIN-HH
	Timi 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 "VINCA"
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

Next theme	Prev. theme
to field of reseach	to contents