Zobrazeno 1 - 10
of 736
pro vyhledávání: '"Quantum XY model"'
Autor:
Yang, Yun-Tong, Luo, Hong-Gang
The nature of phase transitions involving the questions why and how phase transitions take place has not been sufficiently touched in the literature. In contrast, the current attention to certain extent still focus on the description of critical phen
Externí odkaz:
http://arxiv.org/abs/2302.13866
Publikováno v:
Phys. Rev. B 101, 155150 (2020)
The relaxation of many-body system is still a challenging problem that has not well been understood. In this work we exactly calculate the dynamics of the quantum $XY$ model with boundary dissipation, in which the density matrix in terms of Majorana
Externí odkaz:
http://arxiv.org/abs/1902.03563
Publikováno v:
Phys. Rev. B 99, 064422 (2019)
We report all phases and corresponding critical lines of the quantum anisotropic transverse XY model with Dzyaloshinskii-Moriya (DM) interaction along with uniform and alternating transverse magnetic fields (ATXY) by using appropriately chosen order
Externí odkaz:
http://arxiv.org/abs/1710.11037
Autor:
Hofmann, Christoph P.
Within effective field theory we explore the properties of the $d$=3+1 quantum XY model at low temperatures and in weak magnetic or staggered fields. For this parameter regime only few results appear to be known, and furthermore are restricted to one
Externí odkaz:
http://arxiv.org/abs/1602.08036
Autor:
Hou, Changtao, Varma, Chandra M.
Publikováno v:
Phys. Rev. B 94, 201101 (2016)
The two-dimensional dissipative quantum XY model is applicable to the quantum-critical properties of diverse experimental systems, ranging from the superconductor to insulator transitions, ferromagnetic and antiferromagnetic transitions in metals, to
Externí odkaz:
http://arxiv.org/abs/1604.01111
Autor:
Yamanaka, Yuuki, Nishimori, Hidetoshi
We show for the one-dimensional quantum $XY$ model with $s=1/2$ that the energy gap between the ground and first excited states behaves anomalously as a function of the system size at the first-order quantum phase transition. Although it is generally
Externí odkaz:
http://arxiv.org/abs/1501.02926
Publikováno v:
Phys. Rev. B 94, 235156 (2016)
Earlier Monte-Carlo calculations on the dissipative two-dimensional XY model are extended in several directions. We study the phase diagram and the correlation functions when dissipation is very small, where it has properties of the classical 3D-XY t
Externí odkaz:
http://arxiv.org/abs/1605.08419
Publikováno v:
J. Stat. Phys. 164, 1157-1166 (2016)
We show the positivity or negativity of truncated correlation functions in the quantum XY model with spin 1/2 (at any temperature) and spin 1 (in the ground state). These Griffiths-Ginibre inequalities of the second kind generalise an earlier result
Externí odkaz:
http://arxiv.org/abs/1510.03215
Publikováno v:
Phys. Rev. E 92, 052116 (2015)
We re-examine the well-studied one dimensional spin-1/2 $XY$ model to reveal its nontrivial energy spectrum, in particular the energy gap between the ground state and the first excited state. In the case of the isotropic $XY$ model -- the $XX$ model
Externí odkaz:
http://arxiv.org/abs/1508.02814
Publikováno v:
Phys. Rev. B 91, 205129 (2015)
We use quantum Monte-Carlo simulations to calculate the phase diagram and the correlation functions for the quantum phase transitions in the two-dimensional dissipative XY model with and without four-fold anisotropy. Without anisotropy, the model des
Externí odkaz:
http://arxiv.org/abs/1412.7074