Pure dephasing of double-quantum-dot charge qubits in freestanding slabs

Y. Y. Liao, Y. N. Chen

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We study phonon-induced pure dephasing in a double-quantum-dot qubit that is embedded in a freestanding slab. The dispersion relations are evaluated to probe the phonon characteristics of the slab. The pure dephasing factor in the off-diagonal elements of the density matrix is calculated. Numerical results demonstrate that time evolution of this factor exhibits a nonmonotonic feature, resulting from the phonon confinement effect. Significant contribution from individual phonon mode is analyzed in detail. We also study effects of temperature and double-dot position on the pure dephasing. In particular, two remarkable oscillations are observed due to phonon van Hove singularities.

Original languageEnglish
Article number153301
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
Publication statusPublished - 2010 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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