Overhauser effect in individual InP/GaInP dots

Abstract

Sizable nuclear spin polarization is pumped in individual InP/GaInP dots in a wide range of external magnetic fields B_ext=0-5T by circularly polarized optical excitation. We observe nuclear polarization of up to ~40% at Bext=1.5T and corresponding to an Overhauser field of ~1.2T. We find a strong feedback of the nuclear spin on the spin pumping efficiency. This feedback, produced by the Overhauser field, leads to nuclear spin bi-stability at low magnetic fields of Bext=0.5-1.5T. We find that the exciton Zeeman energy increases markedly, when the Overhauser field cancels the external field. This counter-intuitive result is shown to arise from the opposite contribution of the electron and hole Zeeman splittings to the total exciton Zeeman energy.

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Cited by in corpus (15)

• Nuclear spin physics in quantum dots: an optical investigation
• Direct measurement of the hole-nuclear spin interaction in single quantum dots
• Pumping of nuclear spins by the optical solid effect in a quantum dot
• Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy
• Polarization freezing of 10000 optically-cooled nuclear spins by coupling to a single electron
• Charge control in InP/GaInP single quantum dots embedded in Schottky diodes
• Dynamic nuclear polarization in InGaAs/GaAs and GaAs/AlGaAs quantum dots under non-resonant ultra-low power optical excitation
• A quantum interface between light and nuclear spins in quantum dots
• Alignment of nuclear spins in single quantum dots using unpolarized light
• Interfacing nuclear spins in quantum dots to cavity or traveling-wave fields
• Nuclear spin polarization in a single quantum dot pumped by two laser beams
• Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment
• Spin dynamics of quadrupole nuclei in InGaAs quantum dots
• Voltage controlled nuclear polarization switching in a single InGaAs quantum dot
• MOVPE growth, transmission electron microscopy and magneto-optical spectroscopy of individual InAsP/GaInP quantum dots