Spin decoherence from Hamiltonian dynamics in quantum dots

@article{citeulike:2914262, abstract = {The dynamics of a spin-1/2 particle coupled to a nuclear spin bath through an isotropic Heisenberg interaction is studied as a model for the spin decoherence in quantum dots. The time-dependent polarization of the central spin is calculated as a function of the bath-spin distribution and the polarizations of the initial bath state. For short times, the polarization of the central spin shows a Gaussian decay, and at later times it is revived displaying nonmonotonic time dependence. The decoherence time scale depends on moments of the bath-spin distribuition, and also on the polarization strengths in various bath-spin channels. The bath polarizations have a tendency to increase the decoherence time scale. The effective dynamics of the central spin polarization is shown to be described by a master equation with non-Markovian features.}, author = {Rao, Bhaktavatsala D. D. and Ravishankar, V. and Subrahmanyam, V. }, citeulike-article-id = {2914262}, doi = {http://dx.doi.org/10.1103/PhysRevA.74.022301}, journal = {Physical Review A (Atomic, Molecular, and Optical Physics)}, keywords = {experiment, physics, quantum, quantum-computation}, number = {2}, posted-at = {2008-06-21 19:21:47}, priority = {2}, publisher = {APS}, title = {Spin decoherence from Hamiltonian dynamics in quantum dots}, url = {http://dx.doi.org/10.1103/PhysRevA.74.022301}, volume = {74}, year = {2006} }

TY - JOUR ID - citeulike:2914262 L3 - citeulike-article-id:2914262 TI - Spin decoherence from Hamiltonian dynamics in quantum dots JF - Physical Review A (Atomic, Molecular, and Optical Physics) VL - 74 IS - 2 PB - APS N2 - The dynamics of a spin-1/2 particle coupled to a nuclear spin bath through an isotropic Heisenberg interaction is studied as a model for the spin decoherence in quantum dots. The time-dependent polarization of the central spin is calculated as a function of the bath-spin distribution and the polarizations of the initial bath state. For short times, the polarization of the central spin shows a Gaussian decay, and at later times it is revived displaying nonmonotonic time dependence. The decoherence time scale depends on moments of the bath-spin distribuition, and also on the polarization strengths in various bath-spin channels. The bath polarizations have a tendency to increase the decoherence time scale. The effective dynamics of the central spin polarization is shown to be described by a master equation with non-Markovian features. KW - experiment KW - physics KW - quantum KW - quantum-computation AU - Rao, Bhaktavatsala AU - Ravishankar, V AU - Subrahmanyam, V PY - 2006/// UR - http://dx.doi.org/10.1103/PhysRevA.74.022301 ER -