920 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- National Academy of Sciences of UkraineUA354 papers
- Lviv UniversityUA86 papers
- Coventry UniversityGB63 papers
- Lviv Polytechnic National UniversityUA61 papers
- Johannes Kepler University of LinzAT57 papers
- Centre National de la Recherche ScientifiqueFR55 papers
- Otto-von-Guericke-Universität MagdeburgDE42 papers
- University of Pavol Jozef ŠafárikSK27 papers
- Université de LorraineFR26 papers
- Georgetown UniversityUS21 papers
- Max Planck Institute for the Physics of Complex SystemsDE20 papers
- Institute of Physical ChemistryPL16 papers
33 papers · 1 filter
Dynamics of zz spin correlations in the square-lattice spin-1/2 isotropic XY model
Oleg Derzhko, Taras Krokhmalskii
Using the Jordan-Wigner fermionization in two dimensions we obtain the zz wave vector- and frequency-dependent structure factor for the spin-1/2 isotropic XY model on a spatially a…
Square-lattice s=1/2 XY model and the Jordan-Wigner fermions: The ground-state and thermodynamic properties
Oleg Derzhko, Taras Verkholyak, Reimar Schmidt +1
Using the 2D Jordan-Wigner transformation we reformulate the square-lattice s=1/2 XY (XZ) model in terms of noninteracting spinless fermions and examine the ground-state and thermo…
Quantum phase transitions in alternating transverse Ising chains: Rigorous analytical and exact numerical results
Oleg Derzhko, Johannes Richter, Taras Krokhmalskii +1
We examine the ground state properties of the s=1/2 transverse Ising chain with regularly alternating bonds and fields using exact analytical results and exact numerical data for l…
A Marginal Dimension of a Weakly Diluted Quenched m-Vector Model
Yu. Holovatch, M. Dudka, T. Yavors'kii
We calculate a marginal order parameter dimension which in a weakly diluted quenched -vector model controls the crossover from a universality class of a ``pure'' model ($m…
Quantum spin chains with regularly alternating bonds and fields
Oleg Derzhko
We consider the spin-1/2 XY chain in a transverse field with regularly varying exchange interactions and on-site fields. In two limiting cases of the isotropic XX and extremely ani…
Jordan-Wigner fermionization for spin-1/2 systems in two dimensions: A brief review
Oleg Derzhko
We review the papers on the Jordan-Wigner transformation in two dimensions to comment on a possibility of examining the statistical mechanics properties of two-dimensional spin-1/2…
Multicomponent mixture of charged hard-sphere chain molecules in the polymer mean-spherical approximation
Yu. V. Kalyuzhnyi, P. T. Cummings
The analytical solution of the recently proposed ideal chain polymer mean-spherical approximation (Yu.Kalyuzhnyi, Mol.Phys., 94, 735(1998)) is presented for the multicomponent mixt…
Local magnetic properties of periodic nonuniform spin-1/2 XX chains
Oleg Derzhko, Johannes Richter, Oles' Zaburannyi
Using the Jordan-Wigner fermionization, Green function approach and continued fractions we examine rigorously the local magnetizations and the local static susceptibilities of the…
Spin-Peierls instability in a quantum spin chain with Dzyaloshinskii-Moriya interaction
O. Derzhko, J. Richter, O. Zaburannyi
We analysed the ground state energy of some dimerized spin-1/2 transverse XX and Heisenberg chains with Dzyaloshinskii-Moriya (DM) interaction to study the influence of the latter…
Nucleation phenomena in a nonuniform atomic fluid in the electrical field
O. V. Derzhko, V. M. Myhal
The density functional approach is used to study the gas-to-liquid and liquid-to-gas nucleation phenomena in a fluid of two-level atoms in an external electrical field. The influen…
Dynamics of spin correlations in the spin-1/2 isotropic XY chain in a transverse field
O. Derzhko, T. Krokhmalskii, J. Stolze
Dynamic xx spin pair correlation functions for the isotropic spin-1/2 XY chain are calculated numerically for long open chains in the presence of a transverse magnetic field at fin…
Incommensurate Spin-Peierls Phases in the One-Dimensional Quantum Isotropic XY Model
Oleg Derzhko, Taras Krokhmalskii
Using the numerical approach for a study of the thermodynamic properties of the nonuniform one-dimensional spin-1/2 isotropic XY model in a transverse field we examine different la…
Thermodynamic properties of the periodic nonuniform spin-1/2 isotropic XY chains in a transverse field
Oleg Derzhko, Johannes Richter, Oles' Zaburannyi
Using the Jordan-Wigner transformation and the continued-fraction method we calculate exactly the density of states and thermodynamic quantities of the periodic nonuniform spin-1/2…
Order-disorder model of phase transitions in the DMAGaS-DMAAlS family crystals
I. V. Stasyuk, O. V. Velychko
A four-state model is proposed for description of the sequence of phase transitions in ferroelectric crystals of DMAGaS and DMAAlS type. The ordering processes in the subsystems of…
The spin-1/2 transverse XX chain with regularly alternating bonds and fields
Oleg Derzhko, Johannes Richter, Oles' Zaburannyi
We use continued fractions for a study of the thermodynamic properties of the periodic nonuniform spin-1/2 isotropic XY chain in a non-random/random (Lorentzian) transverse field.…
Effective and Asymptotic Critical Exponents of Weakly Diluted Quenched Ising Model: 3d Approach Versus -Expansion
R. Folk, Yu. Holovatch, T. Yavors'kii
We present a field-theoretical treatment of the critical behavior of three-dimensional weakly diluted quenched Ising model. To this end we analyse in a replica limit n=0 5-loop ren…
Spin-1/2 periodic nonuniform XX chains and the spin-Peierls instability
O. Derzhko, J. Richter, O. Zaburannyi
Using continued fractions we obtained the exact result for the density of magnon states of the regularly alternating spin-1/2 XX chain with Dzyaloshinskii-Moriya interaction. We ex…
Ab initio study of the vapour-liquid critical point of a symmetrical binary fluid mixture
O. V. Patsahan, M. P. Kozlovskii, R. S. Melnyk
A microscopic approach to the investigation of the behaviour of a symmetrical binary fluid mixture in the vicinity of the vapour-liquid critical point is proposed. It is shown that…
Multifractality of Brownian motion near absorbing polymers
Christian von Ferber, Yurij Holovatch
We characterize the multifractal behavior of Brownian motion in the vicinity of an absorbing star polymer. We map the problem to an O(M)-symmetric phi^4-field theory relating highe…
The correction-to-scaling exponent in dilute systems
R. Folk, Yu. Holovatch, T. Yavors'kii
The leading correction-to-scaling exponent for the three-dimensional dilute Ising model is calculated in the framework of the field theoretic renormalization group approach. Bo…
Dynamics of transverse correlations in the spin-1/2 isotropic XY chain with a correlated Lorentzian disorder
Oleg Derzhko, Taras Krokhmalskii
Using a numerical approach we examine the dynamics of correlations for the spin- isotropic XY chain with random Lorentzian intersite coupling and transverse field at…
Dynamics and thermodynamics of the pseudospin-electron model in the case of absence of the electron Hubbard correlation. I. The analytical consideration
I. V. Stasyuk, A. M. Shvaika, K. V. Tabunschyk
Dynamics and thermodynamics of the model with local anharmonism in the case of absence of the electron (Hubbard) correlation is investigated in the present work. The correlation fu…
Thermodynamic properties of spin-1/2 transverse XY chain with Dzyaloshinskii-Moriya interaction: Exact solution for correlated Lorentzian disorder
Oleg Derzhko, Johannes Richter
We extend the consideration of the spin-1/2 transverse XY chain with correlated Lorentzian disorder (Phys. Rev. B {\bf 55,} 14298 (1997)) for the case of additional Dzyaloshinskii-…
Multifractal dimension spectra in polymer physics
Christian von Ferber, Yurij Holovatch
We study the multifractal properties of diffusion in the presence of an absorbing polymer and report the numerical values of the multifractal dimension spectra for the case of an a…