Current-Induced Entanglement of Nuclear Spins in Quantum Dots

TL;DR

This paper proposes a mechanism where electric current induces entanglement among nuclear spins in quantum dots, leading to increased spin-flip rates and observable current enhancement under specific conditions.

Contribution

It introduces a novel entanglement mechanism driven by current-induced spin flips in quantum dots, linking nuclear spin correlations to electronic transport properties.

Findings

Current-induced nuclear spin entanglement enhances electron spin-flip rates.

Leakage current increases with nuclear spin correlation, observable under certain residence times.

Nuclear spin correlations significantly impact electron transport in quantum dots.

Abstract

We propose an entanglement mechanism of nuclear spins in quantum dots driven by the electric current accompanied by the spin flip. This situation is relevant to a leakage current in spin-blocked regions where electrons cannot be transported unless their spins are flipped. The current gradually increases the components of larger total spin of nuclei. This correlation among the nuclear spins markedly enhances the spin-flip rate of electrons and hence the leakage current. The enhancement of the current is observable when the residence time of electrons in the quantum dots is shorter than the dephasing time T*_2 of nuclear spins.