Dynamic nuclear polarization with single electron spins

J. R. Petta, J. M. Taylor, A. C. Johnson, A. Yacoby, M. D. Lukin, C. M. Marcus, M. P. Hanson, A. C. Gossard

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Abstract

We polarize nuclear spins in a GaAs double quantum dot by controlling two-electron spin states near the anticrossing of the singlet (S) and mS=+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.

Original languageEnglish (US)
Article number067601
JournalPhysical review letters
Volume100
Issue number6
DOIs
StatePublished - Feb 11 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Petta, J. R., Taylor, J. M., Johnson, A. C., Yacoby, A., Lukin, M. D., Marcus, C. M., Hanson, M. P., & Gossard, A. C. (2008). Dynamic nuclear polarization with single electron spins. Physical review letters, 100(6), [067601]. https://doi.org/10.1103/PhysRevLett.100.067601