Exact diagonalization studies of inelastic light scattering in self-assembled quantum dots

Exact diagonalization and Quantum Monte Carlo studies of quantum dots

We report exact diagonalization and diffusion quantum Monte Carlo calculations of quantum dots (QDs) in which energetics due to electron-electron interactions, magnetic field, and geometrical factors compete and induce interesting ground state configurations. The geometrical effects are generated by different confining potentials such as parabolic shaped, ring shaped, and disordered potentials....

Light-induced spectral diffusion in single self-assembled quantum dots

Small ensembles of In0.55Al0.45As self-assembled quantum dots have been studied at low temperatures using near-field scanning optical microscopy. We observe spectral diffusion in individual quantum dot luminescence lines. The phenomenon increases in magnitude with optical power density, but is not visible at low powers. We believe the spectral diffusion to be caused by long time-scale trapping ...

Kondo excitons in self-assembled quantum dots

A. O. Govorov, K. Karrai, and R. J. Warburton Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA Institute of Semiconductor Physics, 630090 Novosibirsk, Russia Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany Department of Physics, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom ~R...

Charged Excitons in Self-assembled Quantum Dots

We have succeeded in generating highly charged excitons in InAs self-assembled quantum dots by embedding the dots in a field-effect heterostructure. We discover an excitonic Coulomb blockage: over large regions of gate voltage, the exciton charge remains constant. We present here a summary of the emission properties of the charged excitons. INTRODUCTION An exciton is the elementary excitation i...

Inelastic Light Scattering Studies of Borocarbide Superconductors