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Coherent Spin Amplification Using a Beam Splitter

Chengyu Yan, Sanjeev Kumar, Kalarikad Thomas, Patrick See, Ian Farrer, David Ritchie, Jonathan Griffiths, Geraint Jones, and Michael Pepper
Phys. Rev. Lett. 120, 137701 – Published 27 March 2018
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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.

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  • Received 18 October 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.137701

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Chengyu Yan1,2,*, Sanjeev Kumar1,2, Kalarikad Thomas1,2,†, Patrick See3, Ian Farrer4,‡, David Ritchie4, Jonathan Griffiths4, Geraint Jones4, and Michael Pepper1,2

  • 1London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
  • 2Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom
  • 3National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
  • 4Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom

  • *uceeya3@ucl.ac.uk
  • Present address: Department of Physics, Central University of Kerala, Riverside Transit Campus, Padannakkad, Kerala 671314, India.
  • Present address: Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom.

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Issue

Vol. 120, Iss. 13 — 30 March 2018

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