Alignment of nuclear spins in single quantum dots using unpolarized light

Abstract

We report optical pumping of neutral quantum dots leading to nuclear spin alignment with direction insensitive to polarization and wavelength of light. Measurements of photoluminescence of both "dark" and "bright" excitons in single dots reveal that nuclear spin pumping occurs via a virtual spin-flip transition between these states accompanied by photon emission. The sign of the nuclear spin polarization is determined by asymmetry in the exciton energy spectrum, rather than by the sign of the exciton spin polarization.

References in corpus (15)

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Cited by in corpus (9)

• Nuclear spin physics in quantum dots: an optical investigation
• Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots
• Quadrupolar induced suppression of nuclear spin bath fluctuations in self-assembled quantum dots
• Theory of excitons in cubic III-V semiconductor GaAs, InAs and GaN quantum dots: fine structure and spin relaxation
• Electron and nuclear spin properties of the nanohole-filled GaAs/AlGaAs quantum dots
• Dynamic nuclear polarization in InGaAs/GaAs and GaAs/AlGaAs quantum dots under non-resonant ultra-low power optical excitation
• Direct measurement of hyperfine shifts and radiofrequency manipulation of the nuclear spins in individual CdTe/ZnTe quantum dots
• P-shell carriers assisted dynamic nuclear spin polarization in single quantum dots at zero external magnetic field
• MOVPE growth, transmission electron microscopy and magneto-optical spectroscopy of individual InAsP/GaInP quantum dots