Suppression of Zeeman gradients by nuclear polarization in double quantum dots
Abstract
We use electric dipole spin resonance to measure dynamic nuclear polarization in InAs nanowire quantum dots. The resonance shifts in frequency when the system transitions between metastable high and low current states, indicating the presence of nuclear polarization. We propose that the low and the high current states correspond to different total Zeeman energy gradients between the two quantum dots. In the low current state, dynamic nuclear polarization efficiently compensates the Zeeman gradient due to the -factor mismatch, resulting in a suppressed total Zeeman gradient. We present a theoretical model of electron-nuclear feedback that demonstrates a fixed point in nuclear polarization for nearly equal Zeeman splittings in the two dots and predicts a narrowed hyperfine gradient distribution.
Keywords
Cite
@article{arxiv.1209.1510,
title = {Suppression of Zeeman gradients by nuclear polarization in double quantum dots},
author = {S. M. Frolov and J. Danon and S. Nadj-Perge and K. Zuo and J. W. W. van Tilburg and V. S. Pribiag and J. W. G. van den Berg and E. P. A. M. Bakkers and L. P. Kouwenhoven},
journal= {arXiv preprint arXiv:1209.1510},
year = {2015}
}