Effects of dissipation on disordered quantum spin models

TL;DR

This paper investigates how coupling to an Ohmic quantum reservoir influences the static and dynamic behaviors of disordered SU(2) spin models, revealing increased glassy phase formation with stronger environmental coupling.

Contribution

It introduces a direct spin summation method to analyze environmental effects on disordered quantum spin models, highlighting the impact on phase diagram features and phase stability.

Findings

Glassy phase formation increases with environmental coupling strength.

Environmental coupling alters the phase diagram of disordered spin models.

The stability of phases is affected by the dissipation strength.

Abstract

We study the effects of the coupling to an Ohmic quantum reservoir on the static and dynamical properties of a family of disordered SU(2) spin models in a transverse magnetic field using a method of direct spin summation. The tendency to form a glassy phase increases with the strength of the coupling of the system to the environment. We study the influence of the environment on the features of the phase diagram of the various models as well as the stability of the possible phases.