Spin Relaxation in Isotopically Purified Silicon Quantum Dots

TL;DR

This paper studies spin-flip mechanisms in silicon quantum dots, emphasizing the role of spin-orbit coupling and isotopic composition, revealing sensitivity of spin relaxation rates to these factors.

Contribution

It provides a detailed analysis of spin relaxation processes in silicon quantum dots, highlighting the impact of spin-orbit coupling constants and isotope concentration on spin-flip rates.

Findings

Spin-flip rate is highly sensitive to spin-orbit coupling constants.

Nuclei-mediated spin-flip becomes dominant at specific $^{29}$Si concentrations.

The study quantifies the influence of isotopic purity on spin relaxation mechanisms.

Abstract

We investigate spin-flip processes of Si quantum dots due to spin-orbit coupling. We utilize the spin-orbit coupling constants related to bulk and structure inversion asymmetry obtained numerically for two dimensional heterostructures. We find that the spin-flip rate is very sensitive to these coupling constants. We investigate the nuclei-mediated spin-flip process and find the level of the isotope $^{29}$Si concentration for which this mechanism become dominant.