We study spin-dependent electron transport in a quantum ring with three leads in the presence of Rashba spin–orbit interaction using the S-matrix method. The effects of coupling between the leads and the ring on spin transport properties are taken into account. The conditions needed for perfect spin polarization, including the value of electron energy, the angles between the leads, the coupling constant of the leads and the Rashba constant are calculated, using contour maps. It is shown that total spin filtering with zero reflection is possible for low coupling constant as well as high coupling constant. In addition, we obtain the maximum value of the lead coupling constant at which perfect spin polarization can take place.
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2012
American Institute of Physics
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