Coherent oscillations of current due to nuclear spins

TL;DR

This paper proposes a mechanism for slow coherent oscillations of current and nuclear spins in quantum dots, explaining recent experimental observations related to hyperfine interactions and spin blockade.

Contribution

It introduces a new theoretical model for slow oscillations in quantum dot systems influenced by nuclear spins and hyperfine interactions.

Findings

Oscillations depend on magnetic field and anisotropy.

The model qualitatively explains experimental observations.

Highlights the role of hyperfine interaction in spin blockade.

Abstract

We propose a mechanism for very slow coherent oscillations of current and nuclear spins in a quantum dot system, that may qualitatively explain some recent experimental observations. We concentrate on an experimentally relevant double dot setup where hyperfine interaction lifts the spin blockade. We study the dependence of the magnitude and period of the oscillations on magnetic field and anisotropy.