Nuclear Spin Switch in Semiconductor Quantum Dots

Abstract

We show that by illuminating an InGaAs/GaAs self-assembled quantum dot with circularly polarized light, the nuclei of atoms constituting the dot can be driven into a bistable regime, in which either a threshold-like enhancement or reduction of the local nuclear field by up to 3 Tesla can be generated by varying the intensity of light. The excitation power threshold for such a nuclear spin "switch" is found to depend on both external magnetic and electric fields. The switch is shown to arise from the strong feedback of the nuclear spin polarization on the dynamics of spin transfer from electrons to the nuclei of the dot.

References in corpus (7)

• Electron spin relaxation by nuclei in semiconductor quantum dots
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
• Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots
• Nucleus-mediated spin-flip transitions in GaAs quantum dots
• Dynamic nuclear polarization of a single charge-tunable InAs/GaAs quantum dot
• Bistability of the Nuclear Polarisation created through optical pumping in InGaAs Quantum Dots

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