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Article Dans Une Revue Physical Review B Année : 2021

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

C. Leblanc
L. Bessonart
  • Fonction : Auteur
A. Nalitov
  • Fonction : Auteur
Qing Liao
Feng Li
Guillaume Malpuech

Résumé

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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Dates et versions

hal-03414599 , version 1 (04-11-2021)

Identifiants

Citer

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, 2021, 103 (12), pp.125302. ⟨10.1103/PhysRevB.103.125302⟩. ⟨hal-03414599⟩
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