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Nuclear spin switch in semiconductor quantum dots.

Tartakovskii, A. I. and Wright, T. and Russell, A. and Falko, V. I. and Vankov, A. B. and Skiba-Szymanska, J. and Drouzas, I. and Kolodka, R. S. and Skolnick, M. S. and Fry, P. W. and Tahraoui, A. and Liu, H.-Y. and Hopkinson, M. (2007) Nuclear spin switch in semiconductor quantum dots. Physical Review Letters, 98 (2). 026806 1-4. ISSN 1079-7114

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Abstract

We show that by illuminating an InGaAs/GaAs self-assembled quantum dot with circularly polarized light, the nuclei of atoms constituting the dot can be driven into a bistable regime, in which either a thresholdlike enhancement or reduction of the local nuclear field by up to 3 T can be generated by varying the pumping intensity. The excitation power threshold for such a nuclear spin “switch” is found to depend on both the external magnetic and electric fields. The switch is shown to arise from the strong feedback of the nuclear spin polarization on the dynamics of the spin transfer from electrons to the nuclei of the dot.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Additional Information: Falko predicted a bistable behaviour of the nuclear spin polarisation in optically pumped semiconductor quantum dots in a magnetic field, which has been observed experimentally by M. Skolnick's group at Sheffield. Bistability is manifested via the polarisation switch and hysteresis which occur when varying the intensity of illumination. RAE_import_type : Journal article RAE_uoa_type : Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 2352
Deposited By: ep_importer
Deposited On: 01 Apr 2008 15:09
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2352

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