Driven Markovian Quantum Criticality

TL;DR

This paper uncovers a new universality class in one-dimensional driven open quantum systems featuring a dark state, highlighting persistent quantum coherence and non-equilibrium conditions near criticality, distinct from typical driven systems.

Contribution

It introduces a novel universality class for driven open quantum systems with dark states, characterized by persistent quantum coherence and non-equilibrium features.

Findings

Identified a new universality class in driven quantum systems.

Computed critical exponents using functional renormalization group.

Demonstrated persistence of quantum coherence near criticality.

Abstract

We identify a new universality class in one-dimensional driven open quantum systems with a dark state. Salient features are the persistence of both the microscopic non-equilibrium conditions as well as the quantum coherence of dynamics close to criticality. This provides a non-equilibrium analogue of quantum criticality, and is sharply distinct from more generic driven systems, where both effective thermalization as well as asymptotic decoherence ensue, paralleling classical dynamical criticality. We quantify universality by computing the full set of independent critical exponents within a functional renormalization group approach.