Alignment of nuclear spins in single quantum dots using unpolarized light

Details Alignment of nuclear spins in single quantum dots using unpolarized light Alignment of nuclear spins in single quantum dots using unpolarized light

2010-07-07

arxiv.org/abs/1007.1241v2

Phys. Rev. B 83, 125318 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.83.125318

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.

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