16 citations · 19 across the 5 of their papers we have counts for
16 papers
Structural instability of two- and three-dimensional pyrochlore spin lattices in high magnetic fields
Oleg Derzhko, Johannes Richter
We consider the quantum spin- Heisenberg antiferromagnet on the two- and three-dimensional pyrochlore lattices and examine a spin-Peierls mechanism of lowering the total e…
Quantum Phase Transitions in Spin-1/2 Ising Chain in Regularly Alternating Transverse Field: Spin Correlation Functions
Oleg Derzhko, Taras Krokhmalskii
We consider the spin-1/2 Ising chain in a regularly alternating transverse field to examine the effects of regular alternation on the quantum phase transition inherent in the quant…
Jordan-Wigner Approach to Dynamic Correlations in 2D Spin-1/2 Models
Oleg Derzhko, Taras Krokhmalskii
We discuss the dynamic properties of the square-lattice spin-1/2 XY model obtained using the two-dimensional Jordan-Wigner fermionization approach. We argue the relevancy of the fe…
There is life in the old horse yet or what else we can learn studying spin-1/2 XY chains
Oleg Derzhko
We review some recent results on statistical mechanics of the one-dimensional spin-1/2 XY systems paying special attention to the dynamic and thermodynamic properties of the models…
Ground-state correlations of itinerant electrons in the spinless Falicov-Kimball chain and related tight-binding systems
J. Jedrzejewski, T. Krokhmalskii, O. Derzhko
We consider the one-dimensional spinless Falicov-Kimball model of itinerant fermionic particles (``spinless electrons''), which can hop between nearest-neighbour sites only, and of…
Jordan-Wigner fermions and the spin-1/2 anisotropic XY model on a square lattice
Oleg Derzhko, Johannes Richter, Taras Verkholyak
Using the two-dimensional Jordan-Wigner fermionization we calculate the thermodynamic quantities of the (spatially anisotropic) square-lattice spin-1/2 anisotropic XY (XZ) model. W…