Giant magnetoresistance control and nontrivial metallic state manipulation in a transition-metal dichalcogenide spin-valve using a gate voltage
Giant magnetoresistance control and nontrivial metallic state manipulation in a transition-metal dichalcogenide spin-valve using a gate voltage
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使用栅极电压的过渡金属二硫族化物自旋阀中的巨磁阻控制和非平凡金属态操纵
DOI：
10.1088/1361-648x/aaec55
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发表时间：
2018-11
期刊：
影响因子：
--
通讯作者：
Lin Bai
中科院分区：
文献类型：
--
作者：
Chunxu Bai;Yanling Yang;Lin Bai
在这里，我们从理论上研究了单层过渡金属二卤化物自旋阀器件中的谷分辨输运和自旋分辨输运，其中中心引线中同时存在Rashba自旋轨道相互作用和栅极电压。与传统半导体相比，非平凡的金属态，如正常Rashba金属态(NRMS)、反常Rashba金属态(ARMS)和Rashba环金属态(RRMS)，可以在没有磁效应的情况下通过Rashba自旋轨道相互作用产生和操纵。对于非铁磁双结，我们发现谷分辨和自旋分辨的隧道电导可以有效地由入射能量、结长度、Rashba自旋轨道相互作用强度和栅极电压来调节。由于中心引线中的自旋织构和费米波矢，隧道系数和隧道电导都表现出显著的特征，这使得我们能够诊断特殊的状态。对于铁磁自旋阀器件，在中心铅中产生的非平凡的金属基态也直接显示出具有显著独特特征的巨磁电阻。我们进一步揭示了理想谷和自旋巨磁电阻来源于自旋分裂和自旋-谷耦合。这些由谷和自旋分辨的现象对基础研究和应用都很有意义。
Here, we have theoretically studied the valley- and spin-resolved transport in a monolayer transition metal dichalcogenides based spin valve device, where both the Rashba spin orbit interaction and a gate voltage coexist in the central lead. In contrast to conventional semiconductor, nontrivial metallic states, such as, normal Rashba metal state (NRMS), anomalous Rashba metal state (ARMS), and Rashba ring metal state (RRMS), can be generated and manipulated by Rashba spin orbit interaction without the magnetic effect. For a nonferromagnetic double junction, it was found that the valley- and spin-resolved tunneling conductance can be effectively tuned by the incident energy, the junction length, the Rashba spin orbit interaction strength, and the gate voltage. Due to the spin texture and the Fermi wavevectors in the central lead, both the tunneling coefficient and the tunneling conductance all exhibit the remarkable characteristic features which enable us to diagnose the special states. For a ferromagnetic spin valve device, the resulting nontrivial metallic groundstates in the central lead also demonstrate directly in the giant magnetoresistance with notable unique features. We have further revealed that a perfect valley and spin giant magnetoresistance stems from the spin splitting and the spin-valley coupling. These valley- and spin-resolved phenomena are interesting for both fundamental research and applications.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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通讯作者：
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