Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-06-07
New J. Phys. 9 (2007) 219.
Physics
Condensed Matter
Other Condensed Matter
29 preprint pages, 4 figures, to appear in New Journal of Physics
Scientific paper
10.1088/1367-2630/9/7/219
Using the spin wave approximation, we study the decoherence dynamics of a central spin coupled to an antiferromagnetic environment under the application of an external global magnetic field. The external magnetic field affects the decoherence process through its effect on the antiferromagnetic environment. It is shown explicitly that the decoherence factor which displays a Gaussian decay with time depends on the strength of the external magnetic field and the crystal anisotropy field in the antiferromagnetic environment. When the values of the external magnetic field is increased to the critical field point at which the spin-flop transition (a first-order quantum phase transition) happens in the antiferromagnetic environment, the decoherence of the central spin reaches its highest point. This result is consistent with several recent quantum phase transition witness studies. The influences of the environmental temperature on the decoherence behavior of the central spin are also investigated.
Goan* Hsi-Sheng
Yuan Xiao-Zhong
Zhu Ka-di
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