Topological Field Theory of Non-Hermitian Systems

Kohei Kawabata, Ken Shiozaki, Shinsei Ryu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Non-Hermiticity gives rise to unique topological phases without Hermitian analogs. However, the effective field theory has yet to be established. Here, we develop a field-theoretical description of the intrinsic non-Hermitian topological phases. Because of the dissipative and nonequilibrium nature of non-Hermiticity, our theory is formulated solely in terms of spatial degrees of freedom, which contrasts with the conventional theory defined in spacetime. Our theory provides a universal understanding of non-Hermitian topological phenomena such as the unidirectional transport in one dimension and the chiral magnetic skin effect in three dimensions. Furthermore, it systematically predicts new physics; we illustrate this by revealing transport phenomena and skin effects in two dimensions induced by a perpendicular spatial texture. From the field-theoretical perspective, the non-Hermitian skin effect, i.e., the anomalous localization due to non-Hermiticity, is shown to be a signature of an anomaly.

Original languageEnglish (US)
Article number216405
JournalPhysical review letters
Volume126
Issue number21
DOIs
StatePublished - May 28 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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