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Detection of spin polarized currents in quantum point contacts via transverse electron focusing

A. Reynoso·Gonzalo Usaj·C. A. Balseiro
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Abstract

It has been predicted recently that an electron beam can be polarized when it flows adiabatically through a quantum point contact in a system with spin-orbit interaction. Here, we show that a simple transverse electron focusing setup can be used to detect such polarized current. It uses the amplitude's asymmetry of the spin-split transverse electron focusing peak to extract information about the electron's spin polarization. On the other hand, and depending on the quantum point contact geometry, including this one-body effect can be important when using the focusing setup to study many-body effects in quantum point contacts.

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A. Reynoso, Gonzalo Usaj, C. A. Balseiro. 2006-12-20. Detection of spin polarized currents in quantum point contacts via transverse electron focusing. https://doi.org/10.1103/physrevb.75.085321

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