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Quantum metric and wave packets at exceptional points in non-Hermitian systems

Abstract : The usual concepts of topological physics, such as the Berry curvature, are not always relevant for 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 wave-packet trajectories. The quantum metric behavior is responsible for a constant acceleration with a fixed direction, and for a nonvanishing constant velocity with a controllable direction. Both contributions are independent of the wave-packet size.
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https://hal.archives-ouvertes.fr/hal-03414599
Contributor : Guillaume MALPUECH Connect in order to contact the contributor
Submitted on : Thursday, November 4, 2021 - 3:13:26 PM
Last modification on : Sunday, June 26, 2022 - 3:18:36 AM
Long-term archiving on: : Saturday, February 5, 2022 - 6:55:50 PM

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D. D Solnyshkov, C. Leblanc, L. Bessonart, A. Nalitov, Jiahuan Ren, et al.. Quantum metric and wave packets at exceptional points in non-Hermitian systems. Physical Review B, American Physical Society, 2021, 103 (12), pp.125302. ⟨10.1103/PhysRevB.103.125302⟩. ⟨hal-03414599⟩

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