Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Korshunov, S. E."'
Autor:
Korshunov, S. E.
We show that a physical realization of the phase diagram proposed by Minnhagen et al. [Phys. Rev. B 78, 184432 (2008)] for so-called generalized fully frustrated XY model on square lattice can be achieved in arrays of SFS (superconductor-ferromagnet-
Externí odkaz:
http://arxiv.org/abs/1507.06485
Autor:
Korshunov, S. E.
We discuss if phase diagrams of the two-dimensional XY models in which the interaction of nearest planar spins is a nonmonotonic function of the angle u between them, V(u) = - Jcos(u) - Kcos(qu) can include a phase transition related to the dissociat
Externí odkaz:
http://arxiv.org/abs/1207.2349
Autor:
Korshunov, S. E.
The quantum antiferromagnetic spin-1/2 Ising model on a triangular lattice and analogous fully frustrated Ising model on a square lattice with quantum fluctuations induced by the application of the transverse magnetic field are studied at finite temp
Externí odkaz:
http://arxiv.org/abs/1207.1657
Publikováno v:
Phys. Rev. B 85, 174420 (2012)
We investigate the zero-temperature behavior of the classical Heisenberg model on the triangular lattice in which the competition between exchange interactions of different orders favors a relative angle between neighboring spins in the interval (0,2
Externí odkaz:
http://arxiv.org/abs/1202.3214
Autor:
Korshunov, S. E.
Publikováno v:
Phys. Rev. B 85, 134526 (2012)
The phase diagram of the fully frustrated XY model on a honeycomb lattice is shown to incorporate three different ordered phases. In the most unusual of them, a long-range order is related not to the dominance of a particular periodic vortex pattern
Externí odkaz:
http://arxiv.org/abs/1112.3723
Autor:
Ivanov, Dmitri A., Korshunov, S. E.
Publikováno v:
Phys. Rev. B 83, 235129 (2011)
We propose a new quantum model interpolating between the fully frustrated spin-1/2 Ising model in a transverse field and a dimer model. This model contains a resonating-valence-bond phase, including a line with an exactly solvable ground state of the
Externí odkaz:
http://arxiv.org/abs/1102.1912
Publikováno v:
Phys. Rev. B 83, 054402 (2011)
Motivated by the current interest in the quantum dimer model on the triangular lattice, we investigate the phase diagram of the closely related fully-frustrated transverse field Ising model on the honeycomb lattice using classical and semi-classical
Externí odkaz:
http://arxiv.org/abs/1006.5287
Autor:
Korshunov, S. E.
Publikováno v:
EPL 89, 17004 (2010)
We show that the transition of Josephson junctions between the conventional and pi states caused by the decrease in temperature induces in a regular two-dimensional array of such junctions not just a single phase transition between two phases with di
Externí odkaz:
http://arxiv.org/abs/0909.5114
Autor:
Korshunov, S. E.
Publikováno v:
Pis'ma ZhETF 90, 167 (2009) [JETP Lett. 90, 156 (2009)]
We study a disordered quantum solid incorporating two-level systems in which a group of atoms (or a single atom) can experience coherent tunnelling between two different positions and demonstrate that an effective mass deficit induced by the presence
Externí odkaz:
http://arxiv.org/abs/0906.4627
Autor:
Kolokolov, I. V., Korshunov, S. E.
Publikováno v:
Phys. Rev. E 80, 031107 (2009)
The free-energy distribution function of an elastic string in a quenched random potential, P(F), is investigated with the help of the optimal-fluctuation approach. The form of the far-right tail of P(F) is found by constructing the exact solution of
Externí odkaz:
http://arxiv.org/abs/0904.1673