Furthmeier, Stephan and Dirnberger, Florian and Gmitra, Martin and Bayer, Andreas and Forsch, Moritz and Hubmann, Joachim and Schueller, Christian and Reiger, Elisabeth and Fabian, Jaroslav and Korn, Tobias and Bougeard, Dominique (2016) Enhanced spin-orbit coupling in core/shell nanowires. Nature Communications, 7: 12413. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TOPOLOGICAL INSULATORS; SEMICONDUCTOR NANOWIRE; WURTZITE STRUCTURE; MAJORANA FERMIONS; SELECTION-RULES; GAAS NANOWIRES; BAND; HETEROSTRUCTURES; INTERFACE; ELECTRONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Apr 2019 07:31 |
| Last Modified: | 08 Apr 2019 07:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3592 |
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