Magnetic switching and spin filtering in an edge-state device based on HgTe waveguides

Feng Zhai, Xuanping Jin (), Juan Pastrana and Junqiang Lu
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Feng Zhai: Zhejiang Normal University
Xuanping Jin: Zhejiang Normal University
Juan Pastrana: University of Puerto Rico
Junqiang Lu: University of Puerto Rico

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 3, 1-5

Abstract: Abstract We investigate theoretically the edge channel transport in a HgTe waveguide modulated by two magnetic barriers. For an electron incident from a quantum-spin-Hall state in leads, the transmission can depend strongly on the relative orientation (parallel or antiparallel) of the two magnetic barriers as its energy is near the bulk conduction band of leads. For the antiparallel configuration, the transmission is spin-independent and can be suppressed drastically. For the parallel configuration, the electron can transmit nearly perfectly for a proper spin orientation. This contrast in transmission indicates that the proposed edge-state device may serve as a magnetic switch and a spin filter.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-60872-5

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