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

doi:10.1103/PhysRevLett.97.056801

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 language	English (US)
Article number	056801
Journal	Physical review letters
Volume	97
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.97.056801
State	Published - 2006

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.97.056801

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AU - Laird, E. A.

AU - Petta, J. R.

AU - Johnson, A. C.

AU - Marcus, C. M.

AU - Yacoby, A.

AU - Hanson, M. P.

AU - Gossard, A. C.

PY - 2006

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AB - 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.

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

Abstract

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