Enhanced decoherence in the vicinity of a phase transition

Details Enhanced decoherence in the vicinity of a phase transition Enhanced decoherence in the vicinity of a phase transition

2007-06-14

arxiv.org/abs/0706.2127v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We study the decoherence of a spin-1/2 induced by an environment which is on the verge of a continuous phase transition. We consider spin environments described by the ferromagnetic and antiferromagnetic Heisenberg models on a square lattice. As is well known, these two dimensional systems undergo a continuous phase transition at zero temperature, where, the spins order spontaneously. For weak coupling of the central spin to these baths, we find that as one approaches the transition temperature, critical fluctuations make the central spin decohere faster. Furthermore, the decoherence is maximal at zero temperature as signalled by the divergence of the Markovian decoherence rate.

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