Intrinsic spin dynamics in semiconductor quantum dots

TL;DR

This paper explores the intrinsic spin dynamics in semiconductor quantum dots using multiband envelope function approximation, revealing characteristic spin frequencies from THz to optical ranges even without magnetic fields.

Contribution

It introduces a numerical approach to analyze spin dynamics in quantum dots across different III-V materials using an 8x8 k·p Hamiltonian.

Findings

Intrinsic spin dynamics occur without magnetic fields.

Spin frequencies range from THz to optical frequencies.

Dynamics are governed by intraband and interband transitions.

Abstract

We investigate the characteristic spin dynamics corresponding to semiconductor quantum dots within the multiband envelope function approximation (EFA). By numerically solving an $8\times8$ $k\cdot p$ Hamiltonian we treat systems based on different III-V semiconductor materials.It is shown that, even in the absence of an applied magnetic field, these systems show intrinsic spin dynamics governed by intraband and interband transitions leading to characteristic spin frequencies ranging from the THz to optical frequencies.