A spin filter transistor made of topological Weyl semimetal

作者：Shi, Zhangsheng; Wang, Maoji; Wu, Jiansheng^*

来源：Applied Physics Letters, 2015, 107(10): 102403.

DOI：10.1063/1.4930875

• ELECTRICAL DETECTION
• POLARIZATION
• SCHEME

Topological boundary states (TBSs) in Weyl semimetal (WSM) thin film can induce tunneling. Such TBSs are spin polarized inducing spin-polarized current, which can be used to build a spin-filter transistor (SFT) in spintronics. The WSM thin film can be viewed as a series of decoupled quantum anomalous Hall insulator (QAHI) wires connected in parallel, so compared with the proposed SFT made of QAHI nanowire, this SFT has a broader working energy region and easier to be manipulated. And within a narrow region outside this energy domain, the 2D WSM is with very low conductance, so it makes a good on/off switch device with controllable chemical potential induced by liquid ion gate. We also construct a loop device made of 2D WSM with inserted controllable flux to control the polarized current.

• 出版日期2015-9-7
• 单位南方科技大学