Spin-orbit coupling effects are studied in quantum dots in InSb, a narrow-gap material. Competition between different Rashba and Dresselhaus terms is shown to produce wholesale changes in the spectrum. The large (and negative) g-factor and the Rashba field produce states where spin is no longer a good quantum number and intrinsic flips occur at moderate magnetic fields. For dots with two electrons, a singlet-triplet mixing occurs in the ground state, with observable signatures in intraband FIR absorption, and possible importance in quantum computation.
@article{arxiv.cond-mat/0307027,
title = {Spin-orbit coupling and intrinsic spin mixing in quantum dots},
author = {C. F. Destefani and S. E. Ulloa and G. E. Marques},
journal= {arXiv preprint arXiv:cond-mat/0307027},
year = {2009}
}
Comments
REVTEX4 text with 3 figures (high resolution figs available by request). Submitted to PRB