Cascade of y -shaped spin filters in InGaAs/InAs/InGaAs quantum wells

A. W. Cummings, R. Akis, D. K. Ferry, J. Jacob, T. Matsuyama, U. Merkt, G. Meier

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12 Scopus citations


An all-electrical semiconductor device for generating and detecting spin-polarized currents with a two-stage cascade of three-terminal spin filters is discussed, where the first stage serves as the spin polarizer and the second stage serves as the detector. Transport simulations show imbalanced output conductance for higher-order subbands, independent of the spin-orbit coupling strength. However, when only the lowest subband is occupied the simulations show that the conductance asymmetry is spin-orbit dependent. Therefore, the conductance asymmetry of the lowest subband can be used to indicate spin polarization. Based on the simulations an experimental device to measure the spin-dependent conductance asymmetry is proposed.

Original languageEnglish (US)
Article number066106
JournalJournal of Applied Physics
Issue number6
StatePublished - Oct 9 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Cummings, A. W., Akis, R., Ferry, D. K., Jacob, J., Matsuyama, T., Merkt, U., & Meier, G. (2008). Cascade of y -shaped spin filters in InGaAs/InAs/InGaAs quantum wells. Journal of Applied Physics, 104(6), [066106].