Zobrazeno 1 - 10
of 236
pro vyhledávání: '"Derzhko, Oleg"'
Autor:
Rojas, Onofre, de Souza, S. M., Torrico, J., Verissimo, L. M., Pereira, M. S. S., Lyra, M. L., Derzhko, Oleg
Publikováno v:
Phys. Rev. E 110, 024130 (2024)
Recently, a kind of finite-temperature pseudo-transition was observed in several quasi-one-dimensional models. In this work, we consider a genuine one-dimensional extended Hubbard model in the atomic limit, influenced by an external magnetic field an
Externí odkaz:
http://arxiv.org/abs/2406.01344
Publikováno v:
Phys. Rev. B 110, 054428 - Published 15 August 2024
The $S=1/2$ hyperkagome-lattice Heisenberg antiferromagnet allows to study the interplay of geometrical frustration and quantum as well as thermal fluctuations in three dimensions. We use 16 terms of a high-temperature series expansion complemented b
Externí odkaz:
http://arxiv.org/abs/2311.08210
Publikováno v:
Journal of Molecular Liquids, Volume 387, 1 October 2023, 122633
We examine a single-file chain of ammonia molecules in a carbon nanotube. To this end, we use i) molecular dynamics simulations (combined with the charges for ammonia nitrogen and hydrogen obtained from quantum chemistry) and ii) lattice-model calcul
Externí odkaz:
http://arxiv.org/abs/2307.06186
Publikováno v:
Eur. Phys. J. B 96, 50 (2023)
We apply the rotation-invariant Green's function method to study the finite-temperature properties of a $S{=}1/2$ sawtooth-chain (also called $\Delta$-chain) antiferromagnetic Heisenberg model at the fully frustrated point when the exchange couplings
Externí odkaz:
http://arxiv.org/abs/2304.09682
Autor:
Druchok, Maksym, Krasnov, Volodymyr, Krokhmalskii, Taras, Bufalo, Tatiana Cardoso e, de Souza, Sergio Martins, Rojas, Onofre, Derzhko, Oleg
Publikováno v:
J. Chem. Phys. 158, 104304 (2023)
Recently, X.Ma et al. [Phys. Rev. Lett. 118, 027402 (2017)] have suggested that water molecules encapsulated in (6,5) single-wall carbon nanotube experience a temperature-induced quasiphase transition around 150 K interpreted as changes in the water
Externí odkaz:
http://arxiv.org/abs/2302.09362
Publikováno v:
Eur. Phys. J. B (2022) 95: 93
We apply the rotation-invariant Green's function method (RGM) to study the spin $S=1/2$ Heisenberg model on a one-dimensional sawtooth lattice, which has two nonequivalent sites in the unit cell. We check the RGM predictions for observable quantities
Externí odkaz:
http://arxiv.org/abs/2206.05590
Publikováno v:
Phys. Rev. B 105, 144427 (2022)
Over the last decade, the interest in the spin-$1/2$ Heisenberg antiferromagnet (HAF) on the square-kagome (also called shuriken) lattice has been growing as a model system of quantum magnetism with a quantum paramagnetic ground state, flat-band phys
Externí odkaz:
http://arxiv.org/abs/2202.07357
Publikováno v:
Physics Letters A, Volume 387, 28 January 2021, 127020
Recently, a surprising low-temperature behavior has been revealed in a two-leg ladder Ising model with trimer rungs (Weiguo Yin, arXiv:2006.08921). Motivated by these findings, we study this model from another perspective and demonstrate that the rep
Externí odkaz:
http://arxiv.org/abs/2008.03753
Publikováno v:
Eur. Phys. J. B (2020) 93: 161
We consider the strongly anisotropic spin-1/2 $XXZ$ model on the sawtooth-chain lattice with ferromagnetic longitudinal interaction $J^{zz}=\Delta J$ and aniferromagnetic transversal interaction $J^{xx}=J^{yy}=J>0$. At $\Delta=-1/2$ the lowest one-ma
Externí odkaz:
http://arxiv.org/abs/2004.14730
Publikováno v:
Phys. Rev. B 101, 174426 (2020)
The spin-half pyrochlore Heisenberg antiferromagnet (PHAF) is one of the most challenging problems in the field of highly frustrated quantum magnetism. Stimulated by the seminal paper of M.~Planck [M.~Planck, Verhandl. Dtsch. phys. Ges. {\bf 2}, 202-
Externí odkaz:
http://arxiv.org/abs/2002.10548