3 years ago

Temperature Dependence of Spin-Split Peaks in Transverse Electron Focusing

Sanjeev Kumar, Patrick See, David Ritchie, Chengyu Yan, Michael Pepper, Geraint Jones, Jonathan Griffiths, Ian Farrer

Abstract

We present experimental results of transverse electron-focusing measurements performed using n-type GaAs. In the presence of a small transverse magnetic field (B), electrons are focused from the injector to detector leading to focusing peaks periodic in B. We show that the odd-focusing peaks exhibit a split, where each sub-peak represents a population of a particular spin branch emanating from the injector. The temperature dependence reveals that the peak splitting is well defined at low temperature whereas it smears out at high temperature indicating the exchange-driven spin polarisation in the injector is dominant at low temperatures.

Publisher URL: https://link.springer.com/article/10.1186/s11671-017-2321-4

DOI: 10.1186/s11671-017-2321-4

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