The photon-assisted dynamic nuclear polarization effect in a double quantum dot

We report on the Overhauser shift (OHS) of electric dipole spin resonance peaks in the reverse direction to that previously reported. Measuring electric dipole spin resonance in a double quantum dot, we observe two resonance peaks reflecting a Zeeman energy difference between the two quantum dots, a...

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Bibliographic Details
Published inNew journal of physics Vol. 14; no. 12; pp. 123013 - 123023
Main Authors Obata, Toshiaki, Pioro-Ladrière, Michel, Tokura, Yasuhiro, Tarucha, Seigo
Format Journal Article
LanguageEnglish
Published IOP Publishing 10.12.2012
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Summary:We report on the Overhauser shift (OHS) of electric dipole spin resonance peaks in the reverse direction to that previously reported. Measuring electric dipole spin resonance in a double quantum dot, we observe two resonance peaks reflecting a Zeeman energy difference between the two quantum dots, and find that the dependence of the peak position on microwave power is different for each dot. The perturbation theory for hybridizing the flip-flop and photon-assisted tunneling mechanisms is discussed and is found to successfully explain the power dependence. This theory can also consistently explain the OHS in both directions, explaining the experimental results previously reported. Our results reveal the bidirectionality of OHSs and this is expected to play an important part in the development of effective nuclear spin squeezing techniques.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/14/12/123013