Generalized Quantum Geometric Tensor in a Non-Hermitian Exciton-Polariton System
| Autor: | Hu, Y. -M. Robin, Ostrovskaya, Elena A., Estrecho, Eliezer |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Optical Materials Express 14, 664-686 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OME.497010 |
| Popis: | In this work, we review different generalizations of the quantum geometric tensor (QGT) in two-band non-Hermitian systems and propose a protocol for measuring them in experiments. We present the generalized QGT components, i.e. the quantum metric and Berry curvature, for a non-Hermitian hybrid photonic (exciton-polariton) system and show that the generalized non-Hermitian QGT can be constructed from experimental observables. In particular, we extend the existing method of measuring the QGT that uses the pseudospins in photonic and exciton-polariton systems by suggesting a method to construct the left eigenstates from experiments. We also show that the QGT components have clear signatures in wave-packet dynamics, where the anomalous Hall drift arises from both the non-Hermitian Berry curvature and Berry connection, suggesting that both left and right eigenstates are necessary for defining non-Hermitian band geometries and topologies. Comment: 30 pages, 11 figures |
| Databáze: | arXiv |
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