Impurity and spin effects on the magneto-spectroscopy of a THz-modulated nanostructure
Abstract
We present a grid-free density functional theory model appropriate to explore the time evolution of electronic states in a semiconductor nanostructure. The model can be used to investigate both the linear and nonlinear responses of the system to an external short-time perturbation in the THz regime. We use the model to study the effects of impurities on the magnetospectroscopy of a two-dimensional electron gas in a nanostructure excited by an intense THz radiation. We do observe a reduction in the binding energy of the impurity with increasing excitation strength, and at a finite magnetic field we find a slow onset of collective spin oscillations that can be made to vanish with a stronger excitation.
- Publication:
-
Physical Review B
- Pub Date:
- October 2003
- DOI:
- 10.1103/PhysRevB.68.165343
- arXiv:
- arXiv:cond-mat/0304571
- Bibcode:
- 2003PhRvB..68p5343G
- Keywords:
-
- 71.45.Gm;
- 71.70.Di;
- 75.30.Fv;
- 78.67.Lt;
- Exchange correlation dielectric and magnetic response functions plasmons;
- Landau levels;
- Spin-density waves;
- Quantum wires;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- LaTeX,10 pages with 11 embedded postscript figures