IFIBA   22255
INSTITUTO DE FISICA DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
Spin-orbit effects on two-electron states in nanowhisker double quantum dots
Autor/es:
C. L. ROMANO; P. I. TAMBORENEA; S. E. ULLOA
Revista:
PHYSICA E
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009 vol. 41 p. 1577 - 1582
ISSN:
1386-9477
Resumen:
We investigate theoretically the combined effects of the electronelectron and the Rashba spinorbit interactions on two electrons confined in quasi-one-dimensional semiconductor double quantum dots. We study both InSb-based structures, which are of interest due to their strong spinorbit coupling, and also InAs-based systems, which have been recently studied experimentally. We calculate the two-electron wave functions in the effective-mass approximation and explore the interplay between the two interactions on the energy levels and the spin of the states. The energy spectrum as a function of an applied magnetic field shows crossings and anticrossings between triplet and singlet states, associated with level mixing induced by the spinorbit coupling. We find that the fields at which these crossings occur can be naturally controlled by the interdot barrier width, which controls the exchange integral in the structure.