Floquet topological phase transitions induced by uncorrelated or correlated disorder
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866911930776551424 |
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| author | Zheng, Jun-Hui Dutta, Arijit Aidelsburger, Monika Hofstetter, Walter |
| author_facet | Zheng, Jun-Hui Dutta, Arijit Aidelsburger, Monika Hofstetter, Walter |
| contents | The impact of weak disorder and its spatial correlation on the topology of a Floquet system is not well understood so far. In this study, we investigate a model closely related to a two-dimensional Floquet system that has been realized in experiments. In the absence of disorder, we determine the phase diagram and identify a new phase characterized by edge states with alternating chirality in adjacent gaps. When weak disorder is introduced, we examine the disorder-averaged Bott index and analyze why the anomalous Floquet topological insulator is favored by both uncorrelated and correlated disorder, with the latter having a stronger effect. For a system with a ring-shaped gap, the Born approximation fails to explain the topological phase transition, unlike for a system with a point-like gap. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_07035 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Floquet topological phase transitions induced by uncorrelated or correlated disorder Zheng, Jun-Hui Dutta, Arijit Aidelsburger, Monika Hofstetter, Walter Quantum Physics Disordered Systems and Neural Networks Mesoscale and Nanoscale Physics Materials Science Quantum Gases The impact of weak disorder and its spatial correlation on the topology of a Floquet system is not well understood so far. In this study, we investigate a model closely related to a two-dimensional Floquet system that has been realized in experiments. In the absence of disorder, we determine the phase diagram and identify a new phase characterized by edge states with alternating chirality in adjacent gaps. When weak disorder is introduced, we examine the disorder-averaged Bott index and analyze why the anomalous Floquet topological insulator is favored by both uncorrelated and correlated disorder, with the latter having a stronger effect. For a system with a ring-shaped gap, the Born approximation fails to explain the topological phase transition, unlike for a system with a point-like gap. |
| title | Floquet topological phase transitions induced by uncorrelated or correlated disorder |
| topic | Quantum Physics Disordered Systems and Neural Networks Mesoscale and Nanoscale Physics Materials Science Quantum Gases |
| url | https://arxiv.org/abs/2309.07035 |