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Quantum metric and wave packets at exceptional points in non-Hermitian systems
Solnyshkov, DD Leblanc, C Bessonart, L Nalitov, A Ren, J Liao, Q Li, F Malpuech, G
Solnyshkov, DD
Leblanc, C
Bessonart, L
Nalitov, A
Ren, J
Liao, Q
Li, F
Malpuech, G
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2021-03-11
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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.
Citation
Solnyshkov, D.D. , Leblanc, C., Bessonart, L., Nalitov, A., Ren, J., Liao, Q., Li, F. and Malpuech, G. (2021) Quantum metric and wave packets at exceptional points in non-Hermitian systems. Physical Review B, 103, 125302.
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Journal article
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en
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This is an accepted manuscript of an article published by the American Physical Society in Physical Review B on 11/03/2021, available online: https://doi.org/10.1103/PhysRevB.103.125302
The accepted version of the publication may differ from the final published version.
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2469-9950
EISSN
2469-9969