Universal Wilson Loop Bound of Quantum Geometry
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866913998874607616 |
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| author | Yu, Jiabin Herzog-Arbeitman, Jonah Bernevig, B. Andrei |
| author_facet | Yu, Jiabin Herzog-Arbeitman, Jonah Bernevig, B. Andrei |
| contents | We define the absolute Wilson loop winding and prove that it bounds the (integrated) quantum metric from below. This Wilson loop lower bound naturally reproduces the known Chern and Euler bounds of the integrated quantum metric and provides an explicit lower bound of the integrated quantum metric due to the time-reversal protected $Z_2$ index, answering a hitherto open question. In general, the Wilson loop lower bound can be applied to any other topological invariants characterized by Wilson loop winding, such as the particle-hole $Z_2$ index. As physical consequences of the $Z_2$ bound, we show that the time-reversal $Z_2$ index bounds superfluid weight and optical conductivity from below and bounds the direct gap of a band insulator from above. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_00100 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Universal Wilson Loop Bound of Quantum Geometry Yu, Jiabin Herzog-Arbeitman, Jonah Bernevig, B. Andrei Mesoscale and Nanoscale Physics Materials Science Superconductivity We define the absolute Wilson loop winding and prove that it bounds the (integrated) quantum metric from below. This Wilson loop lower bound naturally reproduces the known Chern and Euler bounds of the integrated quantum metric and provides an explicit lower bound of the integrated quantum metric due to the time-reversal protected $Z_2$ index, answering a hitherto open question. In general, the Wilson loop lower bound can be applied to any other topological invariants characterized by Wilson loop winding, such as the particle-hole $Z_2$ index. As physical consequences of the $Z_2$ bound, we show that the time-reversal $Z_2$ index bounds superfluid weight and optical conductivity from below and bounds the direct gap of a band insulator from above. |
| title | Universal Wilson Loop Bound of Quantum Geometry |
| topic | Mesoscale and Nanoscale Physics Materials Science Superconductivity |
| url | https://arxiv.org/abs/2501.00100 |