title: Phonon-mediated electron-spin phase diffusion in a quantum dot.
abstract: An effective spin relaxation mechanism that leads to electron spin decoherence in a quantum dot is proposed. In contrast with the common calculations of spin-flip transitions between the Kramers doublets, we take into account a process of phonon-mediated fluctuation in the electron spin preces-sion and subsequent spin phase diffusion. Specifically, we consider modulations in the longitudinal g factor and hyperfine interaction induced by the phonon-assisted transitions between the lowest electronic states. Prominent differences in the temperature and magnetic field dependence between the proposed mechanism and the spin-flip transitions are expected to facilitate its experimental verification. Numerical estimation demonstrates highly efficient spin relaxation in typical semiconductor quantum dots.
authors.affiliation: Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695-7911, USA.
authors.forename: Y G
authors.initials: YG
authors.lastname: Semenov
authors.forename: K W
authors.initials: KW
authors.lastname: Kim