Spin-orbit interaction induced singlet-triplet resonant Raman transitions in quantum dot helium
Department of Solid State Physics, Yerevan State University - Yerevan, Armenia
2 Department of Physics and Astronomy, University of Manitoba - Winnipeg, Canada R3T 2N2
Received: 28 April 2012
Accepted: 18 June 2012
From our theoretical studies of resonant Raman transitions in two-electron quantum dots (artificial helium atoms) we show that in this system, the singlet-triplet Raman transitions are allowed (in polarized configuration) only in the presence of spin-orbit interactions. With an increase of the applied magnetic field this transition dominates over the singlet-singlet and triplet-triplet transitions. This intriguing effect can therefore be utilized to tune Raman transitions as well as the spin-orbit coupling in few-electron quantum dots.
PACS: 73.21.La – Quantum dots / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 78.30.Fs – III-V and II-VI semiconductors
© EPLA, 2012