Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-25
J. Appl. Phys. 110, 043716 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 8 figures
Scientific paper
10.1063/1.3625240
We study the singlet-triplet relaxation due to the spin-orbit coupling assisted by the electron-phonon scattering in two-electron SiGe/Si/SiGe double quantum dots in the presence of an external magnetic field in either Faraday or Voigt configuration. By explicitly including the electron-electron Coulomb interaction and the valley splitting induced by the interface scattering, we employ the exact-diagonalization method to obtain the energy spectra and the eigenstates. Then we calculate the relaxation rates with the Fermi golden rule. We find that the transition rates can be effectively tuned by varying the external magnetic field and the interdot distance. Especially in the vicinity of the anticrossing point, the transition rates show intriguing features. We also investigate the electric-field dependence of the transition rates, and find that the transition rates are almost independent of the electric field. This is of great importance in the spin manipulation since the lifetime remains almost the same during the change of the qubit configuration from $(1,1)$ to $(2,0)$ by the electric field.
Wang Lanjuan
Wu M. W.
No associations
LandOfFree
Singlet-triplet relaxation in SiGe/Si/SiGe double quantum dots does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Singlet-triplet relaxation in SiGe/Si/SiGe double quantum dots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Singlet-triplet relaxation in SiGe/Si/SiGe double quantum dots will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-295015