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Non-Hermitian Topology in Quantum Physics

Date : Tuesday, May 17th, 2022 10:00 - 11:00 Place : On Zoom Lecturer : Kohei Kawabata Affiliation : Princeton University Committee Chair : Takashi Oka (ext.63280)
e-mail: oka@issp.u-tokyo.ac.jp

Non-Hermiticity enriches topological phases beyond the existing framework for Hermitian topological phases. Unique non-Hermitian topological phenomena have been observed in several classical experiments of mechanical metamaterials, electrical circuits, photonic lattices, and active particles. Recently, beyond the classical regime, signatures of non-Hermitian topology have been experimentally observed also in open quantum atomic and photonic systems. However, it has been unclear how to theoretically characterize non-Hermitian topological phases in quantum many-body systems. In this seminar, we formulate a many-body topological invariant intrinsic to non-Hermitian systems in one dimension [1]. We also discuss entanglement dynamics and phase transitions induced by non-Hermitian topology [2].


[1] K. Kawabata, K. Shiozaki, and S. Ryu, Phys. Rev. B 105, 165137 (2022)

[2] K. Kawabata, T. Numasawa, and S. Ryu, in preparation.

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(Published on: Monday May 9th, 2022)