Effect of exchange interaction on spin dephasing in a double quantum dot

E. A. Laird, J. R. Petta, A. C. Johnson, C. M. Marcus, A. Yacoby, M. P. Hanson, A. C. Gossard

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Abstract

We measure singlet-triplet dephasing in a two-electron double quantum dot in the presence of an exchange interaction which can be electrically tuned from much smaller to much larger than the hyperfine energy. Saturation of dephasing and damped oscillations of the spin correlator as a function of time are observed when the two interaction strengths are comparable. Both features of the data are compared with predictions from a quasistatic model of the hyperfine field.

Original languageEnglish (US)
Article number056801
JournalPhysical review letters
Volume97
Issue number5
DOIs
StatePublished - 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Laird, E. A., Petta, J. R., Johnson, A. C., Marcus, C. M., Yacoby, A., Hanson, M. P., & Gossard, A. C. (2006). Effect of exchange interaction on spin dephasing in a double quantum dot. Physical review letters, 97(5), [056801]. https://doi.org/10.1103/PhysRevLett.97.056801