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Coherent Spin Amplification Using a Beam Splitter

Yan, C; KUMAR, S; Thomas, K; See, P; Farrer, I; Ritchie, D; Griffiths, J; ... Pepper, M; + view all (2018) Coherent Spin Amplification Using a Beam Splitter. Physical Review Letters , 120 (13) , Article 137701. 10.1103/PhysRevLett.120.137701. Green open access

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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.

Type: Article
Title: Coherent Spin Amplification Using a Beam Splitter
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.120.137701
Publisher version: https://doi.org/10.1103/PhysRevLett.120.137701
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10045949
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