Enhanced spin–orbit coupling in core/shell nanowires

Stephan Furthmeier, Florian Dirnberger, Martin Gmitra, Andreas Bayer, Moritz Forsch, Joachim Hubmann, Christian Schüller, Elisabeth Reiger, Jaroslav Fabian, Tobias Korn and Dominique Bougeard ()
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Stephan Furthmeier: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Florian Dirnberger: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Martin Gmitra: Institut für Theoretische Physik, Universität Regensburg
Andreas Bayer: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Moritz Forsch: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Joachim Hubmann: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Christian Schüller: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Elisabeth Reiger: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Jaroslav Fabian: Institut für Theoretische Physik, Universität Regensburg
Tobias Korn: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Dominique Bougeard: Institut für Experimentelle und Angewandte Physik, Universität Regensburg

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract The spin–orbit coupling (SOC) in semiconductors is strongly influenced by structural asymmetries, as prominently observed in bulk crystal structures that lack inversion symmetry. Here we study an additional effect on the SOC: the asymmetry induced by the large interface area between a nanowire core and its surrounding shell. Our experiments on purely wurtzite GaAs/AlGaAs core/shell nanowires demonstrate optical spin injection into a single free-standing nanowire and determine the effective electron g-factor of the hexagonal GaAs wurtzite phase. The spin relaxation is highly anisotropic in time-resolved micro-photoluminescence measurements on single nanowires, showing a significant increase of spin relaxation in external magnetic fields. This behaviour is counterintuitive compared with bulk wurtzite crystals. We present a model for the observed electron spin dynamics highlighting the dominant role of the interface-induced SOC in these core/shell nanowires. This enhanced SOC may represent an interesting tuning parameter for the implementation of spin–orbitronic concepts in semiconductor-based structures.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12413

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DOI: 10.1038/ncomms12413

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