Abstract
Topological zero-line modes(ZLMs)with spin and valley degrees of freedom give rise to spin,valley and spin-valley transport,which support a platform for exploring quantum transport physics and potential applications in spin-tronic/valleytronic devices.In this work,we investigate the beam-splitting behaviors of the charge current due to the ZLMs in a three-terminal system.We show that with certain combinations of ZLMs,the incident charge current along the inter-face between different topological phases can be divided into different polarized currents with unit transmittance in two outgoing terminals.As a result,fully spin-polarized,valley-polarized and spin-valley-polarized electron beam splitters are generated.The mechanism of these splitters is attributed to the cooperative effects of the distribution of the ZLMs and the intervalley and intravalley scatterings that are modulated by the wave-vector mismatch and group velocity mismatch.In-terestingly,half-quantized transmittance of these scatterings is found in a fully spin-valley-polarized electron beam splitter.Furthermore,the results indicate that these splitters can be applicable to graphene,silicene,germanene and stanene due to their robustness against the spin-orbit coupling.Our findings offer a new way to understand the transport mechanism and investigate the promising applications of ZLMs.
基金项目
国家自然科学基金(12304058)
国家自然科学基金(12204073)
国家自然科学基金(12147102)
Guangxi Science and Technology Base and Talent Project(2022AC21077)
广西自然科学基金(2024GXNSFBA010229)
Foundation of Guangxi University of Science and Technology(21Z52)
NETL
NSTL
万方数据