Inhomogeneous Nuclear Spin Flips

Details Inhomogeneous Nuclear Spin Flips Inhomogeneous Nuclear Spin Flips

2009-05-27

arxiv.org/abs/0905.4520v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures (jpg)

Scientific paper

We discuss a feedback mechanism between electronic states in a double quantum dot and the underlying nuclear spin bath. We analyze two pumping cycles for which this feedback provides a force for the Overhauser fields of the two dots to either equilibrate or diverge. Which of these effects is favored depends on the g-factor and Overhauser coupling constant A of the material. The strength of the effect increases with A/V_x, where V_x is the exchange matrix element, and also increases as the external magnetic field B_{ext} decreases.

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