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A Quantum Spin Hall Round Disk as a Spin Rotator and Filter | | Zhan-Feng Jiang
; Wen-Yu Shan
; | | Date: |
6 Aug 2009 | | Abstract: | We study theoretically the spin transport of a Quantum Spin Hall round disk.
When an electron traverses the disk in virtue of the edge states, its spin’s
in-plane component can be rotated by a magnetic flux through the disk. The spin
rotation occurs due to the interference of two helical edge states with
opposite spins, which is regarded as the Aharonov-Bohm effect in the spin space
and a manifestation of the Berry phase. Besides, the disk has a spin filter
effect on the tunneling current when we apply an appropriate magnetic field and
gate voltage on it. The spin polarization ratio can reach 100% when the
couplings between the disk and leads are weak. | | Source: | arXiv, 0908.0890 | | Services: | Forum | Review | PDF | Favorites | |
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