Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine

output

19952026

most citedAtomically thin boron nitride: a tunnelling barrier for graphene devices

920 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2015Show all

41 papers · 1 filter

cond-mat.mtrl-sci2015★ 4 cited

Statistical theory of thermodynamic and dynamic properties of the RbHSO $_{4}$ ferroelectrics

I. R. Zachek, R. R. Levitskii, Ya. Shchur +1

Within the modified four-sublattice model of RbHSO $_{4}$ with taking into account the piezoelectric coupling to the strains $ε_{i}$ , $ε_{4}$ , $ε_{5}$ , and $…

cond-mat.stat-mech2015★ 10 cited

Phase transitions in Bose-Fermi-Hubbard model in the heavy fermion limit: Hard-core boson approach

I. V. Stasyuk, V. O. Krasnov

Phase transitions are investigated in the Bose-Fermi-Hubbard model in the mean field and hard-core boson approximations for the case of infinitely small fermion transfer and repuls…

cond-mat.stat-mech2015★ 2 cited

Phonon-like excitations in the two-state Bose-Hubbard model

I. V. Stasyuk, O. V. Velychko, O. Vorobyov

The spectrum of phonon-like collective excitations in the system of Bose-atoms in optical lattice (more generally, in the system of quantum particles described by the Bose-Hubbard…

cond-mat.stat-mech2015★ 9 cited

Marginal dimensions of the Potts model with invisible states

M. Krasnytska, P. Sarkanych, B. Berche +2

We reconsider the mean-field Potts model with $q$ interacting and $r$ non-interacting (invisible) states. The model was recently introduced to explain discrepancies between theoret…

cond-mat.stat-mech2015★ 13 cited

Spectral properties of four-time fermionic Green's functions

A. M. Shvaika

The spectral relations for the four-time fermionic Green's functions are derived in the most general case. The terms which correspond to the zero-frequency anomalies, known before…

physics.soc-ph2015★ 4 cited

Academic research groups: evaluation of their quality and quality of their evaluation

Bertrand Berche, Yurij Holovatch, Ralph Kenna +1

In recent years, evaluation of the quality of academic research has become an increasingly important and influential business. It determines, often to a large extent, the amount of…

cs.DL2015★ 21 cited

Quantifying the evolution of a scientific topic: reaction of the academic community to the Chornobyl disaster

Olesya Mryglod, Yurij Holovatch, Ralph Kenna +1

We analyze the reaction of academic communities to a particular urgent topic which abruptly arises as a scientific problem. To this end, we have chosen the disaster that occurred i…

quant-ph2015★ 5 cited

Peculiarities of qubit initial-state preparation by nonselective measurements on an overcomplete basis

V. V. Ignatyuk

We consider the qubit initial state preparation due to the nonselective measurements on an overcomplete basis, when the number of outcomes $N = 3$ . To be specific, we have chosen the…

cond-mat.soft2015★ 2 cited

Loop formation in polymers in crowded environment

K. Haydukivska, V. Blavatska

We analyze the probability of a single loop formation in a long flexible polymer chain in disordered environment in $d$ dimensions. The structural defects are considered to be corr…

cond-mat.str-el2015★ 6 cited

Nonequilibrium response of an electron mediated charge-density-wave-ordered material to a large dc electric field

O. P. Matveev, A. M. Shvaika, T. P. Devereaux +1

Using the Kadanoff-Baym-Keldysh formalism, we employ nonequilibrium dynamical mean-field theory to exactly solve for the nonlinear response of an electron-mediated charge-density-w…

cond-mat.dis-nn2015

Comment on "Direct evidence for strong crossover of collective excitations and fast sound in the supercritical state"

T. Bryk, I. Mryglod

We comment on three incorrect claims in the paper by Fomin et al (arXiv:1507.06094) concerning the generalized hydrodynamic methodology and positive sound dispersion in fluids.

cond-mat.stat-mech2015

Self-consistent approach to magnetic ordering and excited site occupation processes in a two-level system

M. A. Korynevskii, V. B. Solovyan

Ferromagnetic ordering in a two-level partially excited system is studied in detail. Magnitudes of magnetization (magnetic order parameter) and lattice ordering (excited level occu…

cond-mat.str-el2015★ 12 cited

Effective low-energy description of almost Ising-Heisenberg diamond chain

Oleg Derzhko, Olesia Krupnitska, Bohdan Lisnyi +1

We consider a geometrically frustrated spin-1/2 Ising-Heisenberg diamond chain, which is an exactly solvable model when assuming part of the exchange interactions as Heisenberg one…

cond-mat.soft2015★ 4 cited

Effect of ion polarization on longitudinal excitations in ionic melts

B. Markiv, M. Tokarchuk

A simplified model for a collective dynamics in ionic melts is proposed for the description of optic-like excitations. Within a polarization model of ionic melt the analytical expr…

cond-mat.stat-mech2015★ 63 cited

Partition function zeros for the Ising model on complete graphs and on annealed scale-free networks

M. Krasnytska, B. Berche, Yu. Holovatch +1

We analyze the partition function of the Ising model on graphs of two different types: complete graphs, wherein all nodes are mutually linked and annealed scale-free networks for w…

math.CA2015★ 1 cited

Feynman integral in $R^{1} \oplus R^{m}$ and complex expansion of $_{2} F_{1}$

Mykola A. Shpot, Tibor K. Pogány

Closed form expressions are proposed for the Feynman integral $$ I_{D, m}(p,q) = \int\frac{d^my}{(2π)^m}\int\frac{d^Dx}{(2π)^D} \frac1{(x-p/2)^2+(y-q/2)^4} \frac1{(x+p/2)^2+(y+q/2)…

cond-mat.stat-mech2015★ 18 cited

Representation of the grand partition function of the cell model: The state equation in the mean-field approximation

Mikhailo Kozlovskii, Oksana Dobush

The method to calculate the grand partition function of a particle system, in which constituents interact with each other via potential, that include repulsive and attractive compo…

cond-mat.stat-mech2015★ 24 cited

Functional renormalization group approach to non-collinear magnets

B. Delamotte, M. Dudka, D. Mouhanna +1

A functional renormalization group approach to $d$ -dimensional, $N$ -component, non-collinear magnets is performed using various truncations of the effective action relevant to stud…

q-bio.PE2015★ 10 cited

Stationary states and spatial patterning in an $S I S$ epidemiology model with implicit mobility

J. M. Ilnytskyi, Y. Kozitsky, H. I. Ilnytskyi +1

By means of the asynchronous cellular automata algorithm we study stationary states and spatial patterning in an $S I S$ model, in which the individuals' are attached to the vertices…

cond-mat.str-el2015★ 23 cited

ESR modes in a Strong-Leg Ladder in the Tomonaga-Luttinger Liquid Phase

M. Ozerov, M. Maksymenko, J. Wosnitza +6

Magnetic excitations in the strong-leg quantum spin ladder compound (C $_{7}$ H $_{10}$ N) $_{2}$ CuBr $_{4}$ (known as DIMPY) in the field-induced Tomonaga-Luttinger spin liquid phase are stud…

cond-mat.soft2015★ 6 cited

Generalization of the van der Waals equation for anisotropic fluids in porous media

Myroslav Holovko, Volodymyr Shmotolokha

The generalized van der Waals equation of state for anisotropic liquids in porous media consists of two terms.One of them is based on the equation of state for hard spherocylinders…

cond-mat.str-el2015★ 6 cited

Nonequilibrium dynamical mean-field theory for the charge-density-wave phase of the Falicov-Kimball model

O. P. Matveev, A. M. Shvaika, T. P. Devereaux +1

Nonequilibrium dynamical mean-field theory (DMFT) is developed for the case of the charge-density-wave ordered phase. We consider the spinless Falicov-Kimball model which can be so…

cond-mat.soft2015★ 1 cited

Lattice models of directed and semiflexible polymers in anisotropic environment