Multiple Nuclear Polarization States in a Double Quantum Dot

TL;DR

This paper reports the observation and modeling of multiple stable nuclear polarization states in a double quantum dot under electron spin resonance, revealing complex behaviors like fast switching and polarization sign reversal.

Contribution

It introduces a theoretical rate equation model that explains multiple stable states and unusual polarization features in double quantum dots under strong driving conditions.

Findings

Multiple stable nuclear polarization states observed.

Model explains fast switching and polarization sign reversal.

Potential for manipulating nuclear fields in quantum devices.

Abstract

We observe multiple stable states of nuclear polarization in a double quantum dot under conditions of electron spin resonance. The stable states can be understood within an elaborated theoretical rate equation model for the polarization in each of the dots, in the limit of strong driving. This model also captures unusual features of the data, such as fast switching and a `wrong' sign of polarization. The results reported enable applications of this polarization effect, including manipulation and control of nuclear fields.