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Phys. Rev. B 78, 125328 (2008) [5 pages]

Spin filtering by a periodic spintronic device

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Amnon Aharony1,*, Ora Entin-Wohlman1,*, Yasuhiro Tokura2, and Shingo Katsumoto3
1Department of Physics and the Ilse Katz Center for Meso- and Nano-Scale Science and Technology, Ben Gurion University, Beer Sheva 84105, Israel
2NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan
3Institute of Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

Received 27 May 2008; revised 3 September 2008; published 30 September 2008

For a linear chain of diamondlike elements, we show that the Rashba spin-orbit interaction (which can be tuned by a perpendicular gate voltage) and the Aharonov-Bohm flux (due to a perpendicular magnetic field) can combine to select only one propagating ballistic mode, for which the electronic spins are fully polarized along a direction that can be controlled by the electric and magnetic fields and by the electron energy. All the other modes are evanescent. For a wide range of parameters, this chain can serve as a spin filter.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.125328
DOI:
10.1103/PhysRevB.78.125328
PACS:
72.25.−b, 71.70.Ej, 73.23.Ad

*Also at Tel Aviv University.

 
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