Photoinduced valley-resolved spin filter based on kagome-lattice nanoribbons
نویسندگان
چکیده
Low-dimensional materials with topologically protected edge states have wide applications in spintronic, valleytronic, and optoelectronic nanodevices. Different from the valley-resolved quantum anomalous Hall (VQAH) state spin-polarized (VSQAH), photon-induced topological kagome-lattice nanoribbons (KLNR) can generate both valley without magnetic substrate or Rashba spin-orbit coupling (SOC). Via Floquet theory, we also propose a 0-photon-extraction scheme to obtain effective Hamiltonian under low-frequency light for first time, analyze properties phase transition of irradiated kagome system, similar those high-frequency case. We then design an all-optically controlled spin filter based on KLNR. Transmissions local current distributions proposed nanodevice confirm this spin-filter effect, which indeed be switched by left- right-circularly-polarized (LCP/RCP) light. believe these optically models extended magnetism-free spin-valley switcher future.
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2023
ISSN: ['1089-7550', '0021-8979', '1520-8850']
DOI: https://doi.org/10.1063/5.0151201