Publication: Dynamical Self-Quenching of Spin Pumping into Double Quantum Dots
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Date
2012
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American Physical Society (APS)
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Brataas, Arne, and Emmanuel I. Rashba. 2012. “Dynamical Self-Quenching of Spin Pumping into Double Quantum Dots.” Physical Review Letters 109 (23) (December 4). doi:10.1103/physrevlett.109.236803.
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Abstract
Nuclear spin polarization can be pumped into spin-blockaded quantum dots by multiple Landau-Zener passages through singlet-triplet anticrossings. By numerical simulations of realistic systems with 107 nuclear spins during 105 sweeps, we uncover a mechanism of dynamical self-quenching which results in a fast saturation of the nuclear polarization under stationary pumping. This is caused by screening the random field of the nuclear spins. For moderate spin-orbit coupling, self-quenching persists but its patterns are modified. Our finding explains low polarization levels achieved experimentally and calls for developing new protocols that break the self-quenching limitations.
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