Quantum Pumping and Nuclear Polarization in the Integer Quantum Hall Regime

Details Quantum Pumping and Nuclear Polarization in the Integer Quantum Hall Regime Quantum Pumping and Nuclear Polarization in the Integer Quantum Hall Regime

2003-07-08

arxiv.org/abs/cond-mat/0307166v3

Europhys. Lett. 69, 109 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, modified text and Fig. 3

Scientific paper

10.1209/epl/i2004-10315-2

We study pumping of charge in a 2DEG in the quantum Hall regime at filling factor $\nu = 2$ (2 spin-split levels of the lowest Landau level). For pumping frequencies that match the Zeeman energy splitting, quantum pumping together with hyperfine interaction between electrons and nuclei induces transitions between the spin-split levels. These lead to a step-like change in the pumped current and to polarization of the nuclei. We present quantitative predictions for both. Our model provides the first quantitative tool to both control and measure the amount of local nuclear polarization in a 2DEG.

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