Asymmetric shape transitions of epitaxial quantum dots

Precise shape engineering of epitaxial quantum dots by growth kinetics

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Single Photon Generation in Epitaxial Quantum Dots

Phase transitions in quantum dots.

We perform Hartree-Fock calculations to show that quantum dots ~i.e., two-dimensional systems of up to twenty interacting electrons in an external parabolic potential! undergo a gradual transition to a spin-polarized Wigner crystal with increasing magnetic-field strength. The phase diagram and ground-state energies have been determined. We tried to improve the ground state of the Wigner crystal...

Shape transition during epitaxial growth of InAs quantum dots on GaAs(001): Theory and experiment

137 family and large islands that show a variety of steeper facets, among them the 101 , 111 , and 1̄1̄1̄ orientations. The calculations of island stability employ a hybrid approach, where the elastic strain relief in the islands is calculated by continuum elasticity theory, while surface energies and surface stresses are taken from density-functional theory calculations that take into account the...

A Fokker-Planck reaction model for the epitaxial growth and shape transition of quantum dots.

We construct a Fokker-Planck reaction (FPR) model to investigate the dynamics of the coupled epitaxial growth and shape transition process of an array of quantum dots (QDs). The FPR model is based on a coupled system of Fokker-Planck equations wherein the distribution of each island type is governed by its own Fokker-Planck equation for growth, with reaction terms describing the shape transitio...