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

Dynamic Nuclear Polarization with Single Electron Spins