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Open Quantum Systems Decoherence

Quantum metric and wavepackets at exceptional points in non-Hermitian systems

arXiv

Authors: D. D. Solnyshkov, C. Leblanc, L. Bessonart, A. Nalitov, J. Ren, Q. Liao, F. Li, G. Malpuech

Year

2020

Paper ID

20690

Status

Preprint

Abstract Read

~2 min

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Abstract

The usual concepts of topological physics, such as the Berry curvature, cannot be applied directly to non-Hermitian systems. We show that another object, the quantum metric, which often plays a secondary role in Hermitian systems, becomes a crucial quantity near exceptional points in non-Hermitian systems, where it diverges in a way that fully controls the description of wavepacket trajectories. The quantum metric behaviour is responsible for a constant acceleration with a fixed direction, and for a non-vanishing constant velocity with a controllable direction. Both contributions are independent of the wavepacket size.

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This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
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The usual concepts of topological physics, such as the Berry curvature, cannot be applied directly to non-Hermitian systems.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2009.06987 [2] arXiv https://arxiv.org/abs/2009.06987 [3] Publisher https://arxiv.org/abs/2009.06987

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