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Hyperfine-Mediated Gate-Driven Electron Spin Resonance

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  • E A Laird
  • C Barthel
  • E I Rashba
  • C M Marcus
  • M P Hanson
  • A C Gossard
Article number246601
<mark>Journal publication date</mark>13/12/2007
<mark>Journal</mark>Physical review letters
Issue number24
Number of pages4
Publication StatusPublished
<mark>Original language</mark>English


An all-electrical spin resonance effect in a GaAs few-electron double quantum dot is investigated
experimentally and theoretically. The magnetic field dependence and absence of associated Rabi
oscillations are consistent with a novel hyperfine mechanism. The resonant frequency is sensitive to
the instantaneous hyperfine effective field, and the effect can be used to detect and create sizable nuclear polarizations. A device incorporating a micromagnet exhibits a magnetic field difference between dots, allowing electrons in either dot to be addressed selectively.