23 citations · 105 across the 30 of their papers we have counts for
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Quantum dynamics of spinful impurity in ideal Bose gas
O. Hryhorchak, V. Pastukhov
We discuss the quench dynamics of an isolated system composed of a single spinful impurity in the transverse Rabi field and bath of non-interacting three- and two-dimensional boson…
Two- and three-body bound states in one-dimensional Fermi bipolaron with three-body interaction
O. Hryhorchak, V. Pastukhov
We discuss the ground-state properties of two bosonic (or spin-1/2 fermionic in a singlet spin state) impurities immersed in a one-dimensional ideal Fermi gas with only the three-b…
Four-body physics in low-dimensional bosons with three-body interaction
V. Polkanov, O. Hryhorchak, V. Pastukhov
The two-channel model for bosons with the three-body interaction is proposed. Similar to the Hamiltonian describing narrow Feshbach resonance in the two-body sector, our model incl…
Evolution of a single spin in ideal Bose gas at finite temperatures
O. Hryhorchak, G. Panochko, V. Pastukhov
We study the finite-temperature dynamics of non-interacting bosons with a single static spinful impurity immersed. A non-zero contact boson-impurity pairwise interaction is assumed…
Bipolaron in one-dimensional fermions with three-body interaction
O. Hryhorchak, G. Panochko, V. Pastukhov
The properties of the one-dimensional population-imbalanced fermions are discussed. The system is assumed to be in the two-body resonance where all two-body scattering leng…
Competition of superfluid phases in low-dimensional spin- fermions with - and -wave interactions
A. Nikolaeva, O. Hryhorchak, V. Pastukhov
The ground state of spin- fermions with contact -wave inter- and -wave intra-species interactions is discussed. Particularly, we formulate the mean field scheme for…
Trapped ideal Bose gas with a few heavy impurities
O. Hryhorchak, V. Pastukhov
We formulate a general scheme for calculation of thermodynamic properties of ideal Bose gas with microscopic number of static impurities immersed, when the system is loaded in the…
Polaron in almost ideal molecular Bose-Einstein condensate
O. Hryhorchak, V. Pastukhov
We discuss properties of a single impurity atom immersed in the spin- dilute Fermi gas with equal populations of two species in the deep Bose-Einstein condensate (BEC) phase.…
Efimov-like physics in fraction-dimensional Bose systems with three-body interaction
O. Hryhorchak, V. Pastukhov
A few-body properties of spinless Bose particles interacting via the contact three-body potential in geometries with fractional dimensions are considered. In the four-body…
Impurity in a three-dimensional unitary Bose gas
O. Hryhorchak, G. Panochko, V. Pastukhov
By using simple and efficient method we discuss properties of a single impurity immersed in three-dimensional Bose gas with the interaction between particles tuned to unitary limit…
Mean-field study of repulsive 2D and 3D Bose polarons
O. Hryhorchak, G. Panochko, V. Pastukhov
The detailed mean-field treatment of the Bose polaron problem in two and three dimensions is presented. Particularly, assuming that impurity is immersed in the dilute Bose gas and…
Large- expansion for condensation and stability of Bose-Bose mixtures at finite temperatures
Orest Hryhorchak, Volodymyr Pastukhov
The two-component mixture of Bose particles with short-range pairwise interaction at finite temperatures in three dimensions is considered. Particularly we examine, by means of the…
Condensation and superfluidity of Bose gas
Orest Hryhorchak, Volodymyr Pastukhov
We perform the comprehensive comparison of properties of the condensate and superfluid densities for the -component three-dimensional Bose gas with the symmetric inter- and intr…
Large- properties of a non-ideal Bose gas
Orest Hryhorchak, Volodymyr Pastukhov
We rigorously discuss the large- thermodynamics of a Bose gas with a short-range two-body potential. Considering the system as a mixture of identical components with symmetr…
-expansion for the critical temperature of the Bose gas
Orest Hryhorchak, Volodymyr Pastukhov
We revised the large- expansion for a three-dimensional Bose system with short-range repulsion in normal phase. Particularly, for the model potential that is characterised only…
First sound velocity in liquid He
O. I. Hryhorchak
Based on the many-boson system structure factor, which takes into account three- and four-particle direct correlations, there was found the first sound velocity temperature behavio…
Internal energy of many-boson system with three- and four-particle direct correlations taken into account
Ivan Vakarchuk, Orest Hryhorchak
In this paper we calculate kinetic, potential and full energy with three- and four-particle direct correlations taken into account at wide temperature region on the base of the den…
Structure functions of many-boson system with regard for direct three- and four-particle correlations
Ivan Vakarchuk, Orest Hryhorchak
On the basis of the expression for the density matrix of interacting Bose particles in the coordinate representation with regard for the direct three- and four-particle correlation…
Effective mass of He atom in superfluid and normal phases
Ivan Vakarchuk, Orest Hryhorchak, Volodymyr Pastukhov +1
The formula for the temperature dependence of the effective mass of a He atom in the superfluid and normal phases is obtained.\,\,This expression for the effective mass all…