首页|Fully spin-polarized,valley-polarized and spin-valley-polarized electron beam splitters utilizing zero-line modes in a three-terminal device

Fully spin-polarized,valley-polarized and spin-valley-polarized electron beam splitters utilizing zero-line modes in a three-terminal device

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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.

topological zero-line modesspin polarizationvalley polarizationquantum transport

吕小龙、杨加恩、谢航

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College of Science,Guangxi University of Science and Technology,Liuzhou 545006,China

College of Physics,Chongqing University,Chongqing 401331,China

Chongqing Key Laboratory for Strongly-Coupled Physics,Chongqing University,Chongqing 401331,China

国家自然科学基金国家自然科学基金国家自然科学基金Guangxi Science and Technology Base and Talent Project广西自然科学基金Foundation of Guangxi University of Science and Technology

1230405812204073121471022022AC210772024GXNSFBA01022921Z52

2024

10.1088/1674-1056/ad2609

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(6)
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