Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots

Details Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots

2005-12-13

arxiv.org/abs/cond-mat/0512269v1

Phys. Rev. Lett. 96, 167403 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.167403

We demonstrate dynamical nuclear spin polarization in the absence of an external magnetic field, by resonant circularly polarized optical excitation of a single electron or hole charged quantum dot. Optical pumping of the electron spin induces an effective inhomogeneous magnetic (Knight) field that determines the direction along which nuclear spins could polarize and enables nuclear-spin cooling by suppressing depolarization induced by nuclear dipole-dipole interactions. Our observations suggest a new mechanism for spin-polarization where spin exchange with an electron reservoir plays a crucial role. These experiments constitute a first step towards quantum measurement of the Overhauser field.

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