Two-electron spin relaxation in a double quantum dot
ORAL
Abstract
Motivated by recent experiments done on GaAs gate-defined double quantum dots (DQD)\footnote{J. R. Petta, \textit{et al}. Science 309,2180(2005)}, we study the two-electron spin relaxation in DQD at various energy detuning $\varepsilon$ and magnetic fields. In particular, we focus on two limits of interdot energy detuning. For $\varepsilon>0$, we investigate the spin blockade by evaluating the electron spin relaxation rate from low energy (1,1) triplet states to the ground (0,2) singlet state. For $\varepsilon<0$, we calculate the electron spin relaxation time at the S(1,1)-$\mathtt{T}{}_{0}$ degeneracy to identify the leakage of an ST$_{0}$ qubit. Particularly, we explore the relaxation channel due to the hyperfine interaction and the electron-phonon interaction.
–
Authors
-
Chia-Wei Huang
Department of Physics, University at Buffalo, the State University of New York
-
Massoud Borhani
SUNY at Buffalo, Department of Physics, University at Buffalo, the State University of New York
-
Xuedong Hu
University at Buffalo, Department of Physics, University of Buffalo, SUNY, Department of Physics, University at Buffalo, The State University of New York, Department of Physics, University at Buffalo, SUNY, Buffalo, NY 14260-1500, University at Buffalo, SUNY, SUNY at Buffalo, Department of Physics, University at Buffalo, the State University of New York