In a crystal lacking inversion symmetry, in the presence of spin-orbit interaction, the spin degeneracy is in general removed at k not equal 0 even in the absence of an external magnetic field. Such is the case for bulk III-V semiconductors having the zincblende structure. In nanostructures having a reduced symmetry with respect to the bulk, additional zero-field spin-splitting mechanisms are allowed. The interplay between the different spin-orbit interactions is thoroughly investigated and the relevance of the spin-splittings for excitonic properties is addressed. In particular, the competition between intraexciton exchange and single particle spin flips in the relaxation of the exciton luminescence polarization is analysed.
Spin splittings in nanostructures without inversion symmetry
LA ROCCA, Giuseppe Carlo;
1997
Abstract
In a crystal lacking inversion symmetry, in the presence of spin-orbit interaction, the spin degeneracy is in general removed at k not equal 0 even in the absence of an external magnetic field. Such is the case for bulk III-V semiconductors having the zincblende structure. In nanostructures having a reduced symmetry with respect to the bulk, additional zero-field spin-splitting mechanisms are allowed. The interplay between the different spin-orbit interactions is thoroughly investigated and the relevance of the spin-splittings for excitonic properties is addressed. In particular, the competition between intraexciton exchange and single particle spin flips in the relaxation of the exciton luminescence polarization is analysed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
