Non-Hermitian chiral anomalies in interacting systems

TL;DR

This paper investigates how non-Hermiticity and many-body interactions influence chiral anomalies and related transport phenomena in quantum systems, revealing additional anomalous terms and corrections in non-equilibrium conditions.

Contribution

It introduces a theoretical framework for analyzing anomalous chiral currents in interacting non-Hermitian systems, highlighting new terms and many-body effects beyond Hermitian models.

Findings

Non-Hermitian interactions produce additional anomalous terms.

Many-body corrections are significant in non-equilibrium or inhomogeneous systems.

Results enhance understanding of anomalous transport in complex quantum systems.

Abstract

The emergence of chiral anomaly entails various fascinating phenomena such as anomalous quantum Hall effect and chiral magnetic effect in different branches of (non-)Hermitian physics. While in the single-particle picture, anomalous currents merely appear due to the coupling of massless particles with background fields, many-body interactions can also be responsible for anomalous transport in interacting systems. In this Letter, we study anomalous chiral currents in systems where interacting massless fermions with complex Fermi velocities are coupled to complex gauge fields. Our results reveal that incorporating non-Hermiticity and many-body interactions gives rise to additional terms in anomalous relations beyond their Hermitian counterparts. We further present that many-body corrections in the subsequent non-Hermitian chiral magnetic field or anomalous Hall effect are nonvanishing in nonequilibrium or inhomogeneous systems. Our results advance efforts in understanding the anomalous transport in interacting non-Hermitian systems.