Entanglement entropy in a spin-boson model and level crossings in an Ising dimer with Dzyaloshinskii-Moriya interaction

Authors

Rafael S. dela Rosa; Francis N. C. Paraan

Source

2017 ICTP Asian Network School and Workshop on Complex Condensed Matter Systems, Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam, P.11 (2017).

Abstract

We calculate the entanglement entropy between a spin and bosonic modes in a spin-boson model using different ground state ansatze. The entanglement entropy saturates exponentially to a constant as the value of the displacement parameters of the boson modes is increased. We also search for level crossings in a system composed of two spins coupled by a Dzyaloshinkskii-Moriya interaction.