Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot

Details Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot

2005-12-05

arxiv.org/abs/cond-mat/0512077v3

Phys. Rev. Lett. 97, 056801 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

see related papers at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.97.056801

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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