Spin Decoherence from Hamiltonian dynamics in Quantum Dots

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dc.creatorRao, D. D. Bhaktavatsala
dc.creatorRavishankar, V.
dc.creatorSubrahmanyam, V.
dc.date2006-02-02
dc.date2006-07-12
dc.date.accessioned2026-07-07T08:12:48Z
dc.date.available2026-07-07T08:12:48Z
dc.descriptionThe 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.
dc.description11 pages, 6 figures Accepted for publication in Phys.Rev A
dc.identifierhttps://arxiv.org/abs/quant-ph/0602027
dc.identifierhttp://arxiv.org/abs/quant-ph/0602027
dc.identifierPhys. Rev. A 74, 022301 (2006)
dc.identifierdoi:10.1103/PhysRevA.74.022301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132581
dc.subjectQuantum Physics
dc.subjectMesoscale and Nanoscale Physics
dc.titleSpin Decoherence from Hamiltonian dynamics in Quantum Dots
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