Abstract
Band structure and spin can modify the simple two-mode far-infrared spectra of quantum dots. In our investigation of these effects we start from a k⋅p Hamiltonian for the conduction, valence, and spin-orbit split-off bands, with potentials for subband formation and harmonic lateral confinement. Taking into account the nonparabolicity of the conduction band and spin-orbit coupling due to the confining potentials, we calculate the dipole excitation spectra of quantum dots on InSb with one and two electrons. Spin-orbit coupling leads to a level anticrossing in the mode and nonparabolicity modifies the mode demonstrating violation of Kohn’s theorem.
- Received 7 April 1993
DOI:https://doi.org/10.1103/PhysRevB.47.16020
©1993 American Physical Society