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Terahertz fields and the dynamical control of spin in quantum dot molecules

✍ Scribed by L. Meza-Montes; Arezky H. Rodríguez; S.E. Ulloa

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
236 KB
Volume
40
Category
Article
ISSN
1386-9477

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✦ Synopsis

We study the time evolution of electronic spin in a double quantum dot system (quantum dot molecule, QDM) under strong harmonic fields in the terahertz region. The dynamics of the wavefunction for a single electron includes the spin-orbit (SO) effects of both Rashba and Dresselhaus types and is obtained in terms of Floquet states and the quasienergy spectrum. A low magnetic field applied perpendicular to the plane of the QDM provides additional flexibility. We find that it is possible to control the electronic spin from a given initial state by proper choice of applied fields. The electron can be either dynamical localized or allowed to oscillate between the dots, with or without SO-induced spin flip.

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