期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 32, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab4319
关键词
topological insulators; symmetry-protected transport; quantum Floquet matter
资金
- Swedish Research Council [621-2014-5972]
Time-periodic external drives have emerged as a powerful tool to artificially create topological phases of matter. Prime examples are Floquet topological insulators (FTIs), where a gapped bulk supports in-gap edge states, protected against symmetry-preserving local perturbations. Similar to an ordinary static topological insulator, the robustness of an edge state in a one-dimensional (1D) FTI shows up as a pinning of its quasienergy level, but now inside one of two distinct bulk gaps. Here we propose a scheme for probing this unique feature by observing transport characteristics of a 1D finite-sized FTI attached to external leads. We present predictions for transmission spectra using a nonequilibrium Green's function approach. Our analysis covers FTIs with time-independent and periodically driven boundary perturbations which either preserve or break the protecting chiral symmetry.
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