期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.107402
关键词
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资金
- National Key R&D Program of China [2017YFA0204503, 2018YFA0704805]
- National Natural Science Foundation of China [12074303, 11804267, 22090022, 21673144, 21790364, 21873065, 21833005]
- Key Scientific and Technological Innovation Team of Shaanxi Province [2021TD-56]
- Beijing Natural Science Foundation of China [21JB0005]
- High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [IDHT20180517, CITTCD20180331]
- Beijing Talents Project [2019A23]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2019KF01]
- Capacity Building for Sci-Tech Innovation-Fundamental Scientific Research Funds
- Beijing Advanced Innovation Center for Imaging Theory and Technology
- projects EU QUANTOPOL of the ANR Labex Ganex [846353]
- project EU Quantum Fluids of Light of the ANR Labex Ganex [ANR-16-CE30-0021, ANR-11-LABX-0014]
- ANR program Investissements d'Avenir through the IDEX-ISITE initiative [16-IDEX-0001 (CAP 20-25)]
This study reports the first experimental measurement of the quantum metric in a non-Hermitian system. The platform under study is an organic microcavity with exciton-polariton eigenstates, demonstrating exceptional points. The measurement shows the divergence of the quantum metric and determines the scaling exponent to be n = -1.01 +/- 0.08, consistent with the theoretical description of second-order exceptional points.
The geometry of Hamiltonian's eigenstates is encoded in the quantum geometric tensor (QGT), containing both the Berry curvature, central to the description of topological matter, and the quantum metric. So far, the full QGT has been measured only in Hermitian systems, where the role of the quantum metric is mostly limited to corrections. On the contrary, in non-Hermitian systems, and, in particular, near exceptional points, the quantum metric is expected to diverge and to often play a dominant role, for example, in the enhanced sensing and in wave packet dynamics. In this Letter, we report the first experimental measurement of the quantum metric in a non-Hermitian system. The specific platform under study is an organic microcavity with exciton-polariton eigenstates, which demonstrate exceptional points. We measure the quantum metric's divergence, and we determine the scaling exponent n = -1.01 +/- 0.08, which is in agreement with the theoretical description of second-order exceptional points.
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