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Stepped discontinuity in a quantum well as a spin flipper


  • A. Dargys

    Corresponding author
    1. Center for Physical Sciences and Technology, Semiconductor Physics Institute, A. Goštauto 11, LT-01108 Vilnius, Lithuania
    • Phone: +370 5 2619887, Fax: +370 5 2627123
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Electron reflection off and transmission through a stepped discontinuity in quantum well (QW), for example, due difference in spin–orbit (SO) interaction constants, effective masses, or potential step, is analyzed in a general case. Correct boundary conditions at the discontinuity are taken into account. It was found that spin flipping of the transmitted beam can be as high as 100%. A simple formula that relates the transmitted spin polarization and SO interaction constants on both sides of the discontinuity is presented and a relevant experimental set-up is proposed to measure SO interaction constants using a homobarrier in the QW.