Floquet engineering of topological phase transitions in quantum spin Hall $α$-$T_{3}$ system
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909458198691840 |
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| author | Lee, Kok Wai Calderon, Mateo Jalen Andrew Yu, Xiang-Long Lee, Ching Hua Ang, Yee Sin Fu, Pei-Hao |
| author_facet | Lee, Kok Wai Calderon, Mateo Jalen Andrew Yu, Xiang-Long Lee, Ching Hua Ang, Yee Sin Fu, Pei-Hao |
| contents | Floquet engineering of topological phase transitions driven by a high-frequency time-periodic field is a promising approach to realizing new topological phases of matter distinct from static states. Here, we theoretically investigate Floquet engineering topological phase transitions in the quantum spin Hall $α$-$T_{3}$ system driven by an off-resonant circularly polarized light. In addition to the quantum spin (anomalous) Hall insulator phase with multiple helical (chiral) edge states, spin-polarized topological metallic phases are observed, where the bulk topological band gap of one spin sub-band overlaps with the other gapless spin sub-band. Moreover, with a staggered potential, the topological invariants of the system depend on whether the middle band is occupied because of the breaking of symmetry with respect to the center of energy-momentum plane. Our work highlights the significance of Floquet engineering in realizing new topological phases in $α$-$T_{3}$ lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_02093 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Floquet engineering of topological phase transitions in quantum spin Hall $α$-$T_{3}$ system Lee, Kok Wai Calderon, Mateo Jalen Andrew Yu, Xiang-Long Lee, Ching Hua Ang, Yee Sin Fu, Pei-Hao Mesoscale and Nanoscale Physics Materials Science Floquet engineering of topological phase transitions driven by a high-frequency time-periodic field is a promising approach to realizing new topological phases of matter distinct from static states. Here, we theoretically investigate Floquet engineering topological phase transitions in the quantum spin Hall $α$-$T_{3}$ system driven by an off-resonant circularly polarized light. In addition to the quantum spin (anomalous) Hall insulator phase with multiple helical (chiral) edge states, spin-polarized topological metallic phases are observed, where the bulk topological band gap of one spin sub-band overlaps with the other gapless spin sub-band. Moreover, with a staggered potential, the topological invariants of the system depend on whether the middle band is occupied because of the breaking of symmetry with respect to the center of energy-momentum plane. Our work highlights the significance of Floquet engineering in realizing new topological phases in $α$-$T_{3}$ lattices. |
| title | Floquet engineering of topological phase transitions in quantum spin Hall $α$-$T_{3}$ system |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2408.02093 |