Direct observation of exchange-driven spin interactions in one-dimensional system

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Direct observation of exchange-driven spin interactions in one-dimensional system

Yan, CY; Kumar, SK; Pepper, MP; Thomas, KT; See, PS; Farrer, IF; Ritchie, DR; ... Jones, GJ; + view all (2017) Direct observation of exchange-driven spin interactions in one-dimensional system. Applied Physics Letters , 111 (4) , Article 042107. 10.1063/1.4989374. Green open access

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Abstract

We present experimental results of transverse electron focusing measurements performed on an n-type GaAs based mesoscopic device consisting of one-dimensional (1D) quantum wires as injector and detector. We show that non-adiabatic injection of 1D electrons at a conductance of e 2 h e2h results in a single first focusing peak, which transforms into two asymmetric sub-peaks with a gradual increase in the injector conductance up to 2e 2 h 2e2h , each sub-peak representing the population of spin-state arising from the spatially separated spins in the injector. Further increasing the conductance flips the spin-states in the 1D channel, thus reversing the asymmetry in the sub-peaks. On applying a source-drain bias, the spin-gap, so obtained, can be resolved, thus providing evidence of exchange interaction induced spin polarization in the 1D systems.

Type:	Article
Title:	Direct observation of exchange-driven spin interactions in one-dimensional system
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1063/1.4989374
Publisher version:	http://dx.doi.org/10.1063/1.4989374
Language:	English
Additional information:	Copyright © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
UCL classification:	UCL 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
URI:	https://discovery.ucl.ac.uk/id/eprint/1566908