Fisher zeroes and dynamical quantum phase transitions for two- and three-dimensional models

TL;DR

This paper investigates the nature of dynamical quantum phase transitions in two- and three-dimensional models, focusing on Fisher zeroes and non-analyticities in the return rate, extending understanding beyond one-dimensional cases.

Contribution

It establishes the relation between Fisher zero densities and non-analyticities in higher dimensions, providing analytical insights for complex models.

Findings

Non-zero Fisher zero density at the boundary causes cusps in the derivative of the return rate.

In higher dimensions, non-analyticities are linked to the behavior of Fisher zeroes.

Analytical results are obtained for specific 2D and 3D models.

Abstract

Dynamical quantum phase transitions are non-analyticities in a dynamical free energy (or return rate) which occur at critical times. Although extensively studied in one dimension, the exact nature of the non-analyticity in two and three dimensions has not yet been fully investigated. In two dimensions, results so far are known only for relatively simple two-band models. Here we study the general two- and three-dimensional cases. We establish the relation between the non-analyticities in different dimensions, and the functional form of the densities of Fisher zeroes. We show, in particular, that entering a critical region where the density of Fisher zeroes is non-zero at the boundary always leads to a cusp in the derivative of the return rate while the return rate itself is smooth. We illustrate our results by obtaining analytical results for exemplary two- and three-dimensional models.