Quantum metric and wave packets at exceptional points in non-Hermitian systems
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AbstractThe 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.
CitationSolnyshkov, 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.
PublisherAmerican Physical Society
JournalPhysical Review B
DescriptionThis 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.
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by-nc-nd/4.0/