Dynamic Nuclear Polarization with Single Electron Spins

Details Dynamic Nuclear Polarization with Single Electron Spins Dynamic Nuclear Polarization with Single Electron Spins

2007-09-06

arxiv.org/abs/0709.0920v2

Phys. Rev. Lett. 100, 067601 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers available at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.100.067601

We polarize nuclear spins in a GaAs double quantum dot by controlling two-electron spin states near the anti-crossing of the singlet (S) and m_S=+1 triplet (T+) using pulsed gates. An initialized S state is cyclically brought into resonance with the T+ state, where hyperfine fields drive rapid rotations between S and T+, 'flipping' an electron spin and 'flopping' a nuclear spin. The resulting Overhauser field approaches 80 mT, in agreement with a simple rate-equation model. A self-limiting pulse sequence is developed that allows the steady-state nuclear polarization to be set using a gate voltage.

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