期刊
PHYSICAL REVIEW B
卷 103, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L041402
关键词
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资金
- Singapore Ministry of Education Academic Research Fund Tier-3 [MOE2017-T3-1-001]
- Singapore NRF [NRF-NRFI2017-04]
- Singapore Ministry of Education Academic Research Fund Tier-3 (WBS) [R-144-000-425-592]
- Singapore NRF (WBS) [R-144-000-378-281]
Floquet higher-order topological insulators (FHOTIs) are a novel topological phase that can occur in periodically driven lattices. An experimentally realistic bipartite system can host FHOTI phases and exhibit interesting phase transitions without breaking lattice symmetry. In the FHOTI phase, the lattice features corner modes at specific eigenphases that are robust against disorder.
Floquet higher-order topological insulators (FHOTIs) are a novel topological phase that can occur in periodically driven lattices. An appropriate experimental platform to realize FHOTIs has not yet been identified. We introduce a periodically driven bipartite (two-band) system that hosts FHOTI phases without static counterparts, and predict that this lattice can be realized in experimentally realistic optical waveguide arrays, similar to those previously used to study anomalous Floquet insulators. The model exhibits interesting phase transitions from first-order to second-order topological matter by tuning a coupling strength parameter, without breaking lattice symmetry. In the FHOTI phase, the lattice hosts corner modes at eigenphase 0 or pi, which are robust against disorder in the individual couplings.
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