Regular Article

Effect of Dzyaloshinskii–Moriya interaction on quantum entanglement in superconductors models of high T_c

Departamento de Física, Centro Federal de Educação Tecnológica de Minas Gerais, 30510-000 Belo Horizonte, MG, Brazil

^a e-mail: lslima@cefetmg.br

Received: 27 August 2018
Received in final form: 9 November 2018
Published online: 10 January 2019

Abstract

The modified spin-wave (MSW) theory and SU(N) Schwinger boson theory (SBW) are employed to study the quantum entanglement in one- (1D) and two-dimensional (2D) Heisenberg antiferromagnets with Dzyaloshinskii–Moriya (DM) interaction which are models to superconducting materials of high critical temperature T_c such as La₂CuO₄. For the 1D case, we consider integer spin and for 2D case, since the behavior is independent on the spin value, we consider the one-half-spin and square lattice. We get the entanglement entropy in function of the temperature T where we have not gotten large variation of the quantum entanglement with the changing of the anisotropy Δ and DM interaction constant D.