Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots
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Rudner-2013-Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots.pdf
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874.69 KB
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Author(s)
Rudner, M. S.
Levitov, Leonid
Date Issued
February 2013
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.086601
