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 language | English (US) |
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Article number | 067601 |
Journal | Physical review letters |
Volume | 100 |
Issue number | 6 |
DOIs | |
State | Published - Feb 11 2008 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy