Spin Decoherence from Hamiltonian dynamics in Quantum Dots

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 revives displaying nonmonotonic time dependence. The decoherence time scale dep ends 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 describ ed by a master equation with non-markovian features.

11 pages, 6 figures Accepted for publication in Phys.Rev A

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Cited by in corpus (9)

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• Teleportation in the presence of common bath decoherence at the transmitting station
• Time evolution and decoherence of a spin-1/2 particle coupled to a spin bath in thermal equilibrium
• Generation of entangled channels for perfect teleportation channels using multi-electron quantum dots
• Controlled dynamics of qubits in the presence of decoherence
• Quantum frustration of dissipation by a spin bath
• W-like states of N uncoupled spins 1/2
• Decoherence of two-electron spin states in quantum dots
• Estimation of the spatial decoherence time in circular quantum dots