dorsal/arxiv
View SchemaSpin Decoherence from Hamiltonian dynamics in Quantum Dots
| Authors | D. D. Bhaktavatsala Rao, V. Ravishankar, V. Subrahmanyam |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0602027 |
| URL | https://arxiv.org/abs/quant-ph/0602027 |
| DOI | 10.1103/PhysRevA.74.022301 |
| Journal | Phys. Rev. A 74, 022301 (2006) |
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.
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"abstract": "The dynamics of a spin-1/2 particle coupled to a nuclear spin bath through an\nisotropic Heisenberg interaction is studied, as a model for the spin\ndecoherence in quantum dots. The time-dependent polarization of the central\nspin is calculated as a function of the bath-spin distribution and the\npolarizations of the initial bath state. For short times, the polarization of\nthe central spin shows a gaussian decay, and at later times it revives\ndisplaying nonmonotonic time dependence. The decoherence time scale dep ends on\nmoments of the bath-spin distribuition, and also on the polarization strengths\nin various bath-spin channels. The bath polarizations have a tendency to\nincrease the decoherence time scale. The effective dynamics of the central spin\npolarization is shown to be describ ed by a master equation with non-markovian\nfeatures.",
"arxiv_id": "quant-ph/0602027",
"authors": [
"D. D. Bhaktavatsala Rao",
"V. Ravishankar",
"V. Subrahmanyam"
],
"categories": [
"quant-ph",
"cond-mat.mes-hall"
],
"doi": "10.1103/PhysRevA.74.022301",
"journal_ref": "Phys. Rev. A 74, 022301 (2006)",
"title": "Spin Decoherence from Hamiltonian dynamics in Quantum Dots",
"url": "https://arxiv.org/abs/quant-ph/0602027"
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