Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-03-05
Phys. Rev. B 79, 104428 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
accepted by Phys. Rev. B
Scientific paper
10.1103/PhysRevB.79.104428
For an electron spin in coupling with an interacting spin chain via hyperfine-type interaction, we investigate the dynamical evolutions of the pairwise entanglement of the spin chain and a correlation function joined the electron spin with a pair of chain spins in correspondence to the electron spin coherence evolution. Both quantities manifest a periodic and a decaying evolution. The entanglement of the spin bath is significant in distinguishing the zero-coherence status exhibited in periodic and decoherence evolutions of the electron spin. The periodical concurrence evolution of the spin bath characterizes the whole system in a coherence-preserving phase, particularly for the case that the associated periodic coherence evolution is predominated by zero-value in the infinite chain-length limit, which was often regarded as the realization of decoherence.
Su Zhao-Bin
Wang Bing-Shen
Wang Zhi-Hui
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