Observation of spin dependent photocoductivity in InSb quantum well nanowires

We report on the electrical detection of spin dependent photoconductivity in 500 nm wide InSb quantum well nanowires using the optical orientation of electron spins. By applying weak magnetic fields (≈200 mT), we observe a spin filtering effect of classical origin caused by spin dependent back scatt...

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Veröffentlicht in:Applied physics letters 2012-10, Vol.101 (15)
Hauptverfasser: Li, Juerong, Gilbertson, A. M., Litvinenko, K. L., Cohen, L. F., Clowes, S. K.
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Sprache:eng
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Zusammenfassung:We report on the electrical detection of spin dependent photoconductivity in 500 nm wide InSb quantum well nanowires using the optical orientation of electron spins. By applying weak magnetic fields (≈200 mT), we observe a spin filtering effect of classical origin caused by spin dependent back scattering of electrons from the sidewalls. Spin dependent features in the longitudinal photovoltage decay with temperature and disappears at characteristic energy (≈50 K) consistent with the theoretical spin splitting and the thermal level broadening. We show that the observed signal is due to the inversion asymmetry of the quantum well, with an additional Zeeman contribution.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4760223