C. F. Destefani

Oscillatory spin relaxation rates in quantum dots

g

Spin carrier dynamics under full spin–orbit coupling

-factor tuning of electrons in quantum dots is studied as a function of in-plane and perpendicular magnetic fields for different confinements. Rashba and Dresselhaus effects are considered, and comparison is made between wide and narrow-gap materials. The interplay between external magnetic fields and intrinsic spin-orbit couplings is analyzed, with two distinct phases found in the spectrum for GaAs in perpendicular field. The anisotropy of the

Spin relaxation and g-factor manipulation in quantum dots

g

Intrinsic & phonon‐induced spin relaxation in quantum dots

factor is reported, and good agreement with available experimental findings is obtained.

Spin-orbit coupling and magnetic spin states in cylindrical quantum dots

Phonon-induced spin relaxation rates in quantum dots are studied as function of in-plane and perpendicular magnetic fields, temperature and electric field, for different dot sizes. We consider Rashba and Dresselhaus spin-orbit mixing in diferent materials, and show how Zeeman sublevels can relax via piezoelectric and deformation potential coupling to acoustic phonons. We find that strong lateral and vertical confinements may induce minima in the rates at particular values of the magnetic field, where spin relaxation times can reach even seconds. We obtain good agreement with experimental findings in GaAs quantum dots.

Multielectron Correlation in High-Harmonic Generation: A 2D Model Analysis

Abstract We discuss how symmetries and anisotropies of electron states, within full spin–orbit coupling, form independent circular polarization spinors. The aspects of a voltage controlled multichannel spin-filtering regime is discussed.

Spin-orbit and electronic interactions in narrow-gap quantum dots

Phonon-induced spin relaxation rates and electron g-factor tuning of quantum dots are studied as function of in-plane and perpendicular magnetic fields for different dot sizes. We consider Rashba and Dresselhaus spin-orbit mixing in wide and narrow-gap semiconductors, and show how Zeeman sublevels can relax via piezoelectric (GaAs) and deformation (InSb) potential coupling to acoustic phonons. We find that strong confinement may induce minima in the rates at particular values of the magnetic field (due to a magnetic field-induced cancellation of the spin-orbit effects), where spin relaxation times can reach seconds. We also report on g-factor anisotropy. We obtain good agreement with available experimental values.

Spin-orbit coupling and intrinsic spin mixing in quantum dots

Spin relaxation rates and effective g‐factor of GaAs quantum dots are studied. Both piezoelectric and deformation potentials for acoustic phonons, as well as the intrinsic mixing induced by both Rashba and Dresselhaus spin‐orbit couplings, are considered. Influence of different quantum dot parameters is analyzed, and good agreement with experiments is found.

Spin-orbit coupling and the singlet-triplet transition in lateral double quantum dots

We make detailed analysis of each possible spin-orbit coupling of zincblende narrow-gap cylindrical quantum dots built in two-dimensional electron gas. These couplings are related to both bulk (Dresselhaus) and structure (Rashba) inversion asymmetries. We study the competition between electron-electron and spin-orbit interactions on electronic properties of 2-electron quantum dots.