Nonequilibrium electron spin polarization in a double quantum dot. Lande mechanism

TL;DR

This paper investigates how differences in g-factors in a double quantum dot can induce electron spin polarization through Lande mechanism, which can persist despite nuclear magnetic field decoherence.

Contribution

It introduces the Lande mechanism as a source of nonequilibrium spin polarization in double quantum dots under moderate magnetic fields.

Findings

Oscillations between singlet and triplet states induced by g-factor differences.

Partial survival of spin polarization despite nuclear magnetic field decoherence.

Insights into spin dynamics relevant for quantum information applications.

Abstract

In moderately strong magnetic fields, the difference in Lande g-factors in each of the dots of a coupled double quantum dot device may induce oscillations between singlet and triplet states of the entangled electron pair and lead to a nonequilibrium electron spin polarization. We will show that this polarization may partially survive the rapid inhomogeneous decoherence due to random nuclear magnetic fields.