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Published on: October 11, 2016
Coherent Spin Amplification Using a Beam Splitter
Chengyu Yan1,2, Sanjeev Kumar1,2, Kalarikad Thomas1,2
1London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom.
Abstract:
We report spin amplification using a capacitive beam splitter in n-type GaAs where the spin polarization is monitored via a transverse electron focusing measurement. It is shown that partially spin-polarized current injected by the emitter can be precisely controlled, and the spin polarization associated with it can be amplified by the beam splitter, such that a considerably high spin polarization of around 50% can be obtained. Additionally, the spin remains coherent as shown by the observation of quantum interference. Our results illustrate that spin-polarization amplification can be achieved in materials without strong spin-orbit interaction.
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