Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots
Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots. / Rudner, Mark Spencer; Levitov, Leonid.
I: Physical Review Letters, Bind 110, Nr. 8, 086601, 20.02.2013.Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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TY - JOUR
T1 - Self-Sustaining Dynamical Nuclear Polarization Oscillations in Quantum Dots
AU - Rudner, Mark Spencer
AU - Levitov, Leonid
PY - 2013/2/20
Y1 - 2013/2/20
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.110.086601
DO - 10.1103/PhysRevLett.110.086601
M3 - Letter
VL - 110
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 8
M1 - 086601
ER -
ID: 90871700