Dynamical Self-Quenching of Spin Pumping into Double Quantum Dots

Abstract

Nuclear spin polarization can be pumped into spin-blocked quantum dots by multiple Landau- Zener passages through singlet-triplet anticrossings. By numerical simulations of realistic systems including approximately $10^7$ nuclear spins during $10^5$ 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 of the field of the nuclear spins. In systems with moderate spin-orbit coupling, self-quenching also screens the spin-orbit interaction. The mechanism is generic and remains robust under a moderate noise. Our finding explains low polarization levels achieved experimentally and calls for developing new protocols that break the self-quenching limitations.

4+ pages, 4 figures

References in corpus (8)

• Coherent control of a single electron spin with electric fields
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
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• Nuclear State Preparation via Landau-Zener-Stueckelberg transitions in Double Quantum Dots
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Cited by in corpus (7)

• Quenching of dynamic nuclear polarization by spin-orbit coupling in GaAs quantum dots
• Theory of dynamic nuclear polarization and feedback in quantum dots
• The theory of coherent dynamic nuclear polarization in quantum dots
• Preparation of Non-equilibrium Nuclear Spin States in Double Quantum Dots
• Characterization of S-T${}_{+}$ Transition Dynamics via Correlation Measurements
• The formation of a nuclear-spin dark state in silicon
• Self-Quenching of Nuclear Spin Dynamics in Central Spin Problem