English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study theoretically spin relaxation during phonon-assisted tunneling of asingle electron in self-assembled InAs/GaAs quantum-dot molecules formed byvertically stacked dots. We find that the spin-flip tunneling rate may be ashigh as 1% of the spin-conserving one. By studying the dependence of spinrelaxation rate on external fields, we show that the process is active at aconsiderable rate even without the magnetic field, and scales with the latterdifferently than the relaxation in a Zeeman doublet. Utilizing a multiband$\boldsymbol{k}\cdot\boldsymbol{p}$ theory, we selectively investigate theimpact of various spin-mixing terms in the electron energy and carrier-phononinteraction Hamiltonians. As a result, we identify the main contribution tocome from the Dresselhaus spin-orbit interaction, which is responsible for thezero-field effect. At magnetic fields above $\sim$ 15 T, this is surpassed byother contributions due to the structural shear strain. We also study theimpact of the sample morphology and determine that the misalignment of the dotsmay enhance relaxation rate by over an order of magnitude. Finally, via virtualtunneling at nonzero temperature, the process in question also affectsstationary electrons in tunnel-coupled structures and provides a Zeeman-doubletspin relaxation channel even without the magnetic field.

Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules