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Spin-orbit interaction in symmetric wells with two subbands

Bernardes, Esmerindo and Schliemann, John and Lee, Minchul and Egues, J. Carlos and Loss, Daniel. (2007) Spin-orbit interaction in symmetric wells with two subbands. Physical review letters, Vol. 99, H. 7 , 076603, 4 S..

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Official URL: http://edoc.unibas.ch/dok/A5254622

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Abstract

We investigate the spin-orbit (SO) interaction in two-dimensional electron gases in quantum wells with two subbands. From the 8x8 Kane model, we derive a new intersubband-induced SO term which resembles the functional form of the Rashba SO but is nonzero even in symmetric structures. This follows from the distinct parity of the confined states (even or odd) which obliterates the need for asymmetric potentials. We self-consistently calculate the new SO coupling strength for realistic wells and find it comparable to the usual Rashba constant. Our new SO term gives rise to a nonzero ballistic spin-Hall conductivity, which changes sign as a function of the Fermi energy (epsilon(F)) and can induce an unusual Zitterbewegung with cycloidal trajectories without magnetic fields.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physical Society
ISSN:0031-9007
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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