Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots
Author(s)
Rudner, M. S.; Levitov, Leonid
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Early experiments on spin-blockaded double quantum dots revealed robust, large-amplitude current oscillations in the presence of a static (dc) source-drain bias. Despite experimental evidence implicating dynamical nuclear polarization, the mechanism has remained a mystery. Here we introduce a minimal albeit realistic model of coupled electron and nuclear spin dynamics which supports self-sustained oscillations. Our mechanism relies on a nuclear spin analog of the tunneling magnetoresistance phenomenon (spin-dependent tunneling rates in the presence of an inhomogeneous Overhauser field) and nuclear spin diffusion, which governs dynamics of the spatial profile of nuclear polarization. The proposed framework naturally explains the differences in phenomenology between vertical and lateral quantum dot structures as well as the extremely long oscillation periods.
Date issued
2013-02Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Rudner, M. S., and L. S. Levitov. “Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots.” Physical Review Letters 110.8 (2013). © 2013 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114