Journal
PHYSICS LETTERS A
Volume 375, Issue 2, Pages 187-191Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2010.10.047
Keywords
Spin splitters; Rashba spin-orbit interaction; Mesoscopic rings
Categories
Funding
- TUBITAK [108T743]
- EU [203953]
- PNCDI2 program [515/2009, 45N/2009]
- TUBA
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Using the non-equilibrium Greens' function formalism we calculate the spin currents in a one-dimensional ring coupled to three leads and in the presence of perpendicular magnetic flux (1) and Rashba spin-orbit coupling. A finite bias is applied between the input lead and the other two output leads. We show that the spin-orbit coupling allows one to operate this system as a spin splitter, i.e. the output leads deliver spin-polarized currents with different orientations. We find that the spin splitter operation can be tuned at integer multiples of phi/phi(0). Its efficiency depends not only on the value of the Rashba coupling but also on the bias applied between the input and output leads. The selected spin orientation of the output leads can be reversed by a slight change of their contact position. We discuss as well the connection between the spin splitter operation and the spectral properties of the ring. (C) 2010 Elsevier B.V. All rights reserved.
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