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Non-Hermitian chiral anomalies in interacting systems

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arxiv 2306.14766 v1 pith:ZFX7GGDK submitted 2023-06-26 cond-mat.mes-hall cond-mat.str-elquant-ph

Non-Hermitian chiral anomalies in interacting systems

classification cond-mat.mes-hall cond-mat.str-elquant-ph
keywords anomalouschiralsystemsinteractingeffectmany-bodynon-hermitiancomplex
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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  1. Atiyah--Singer Index Theorem for Non-Hermitian Dirac Operators

    hep-th 2026-04 unverdicted novelty 7.0

    The index of non-Hermitian Dirac operators that anticommute with a chirality operator is topologically protected when the operators are diagonalizable and elliptic.