1. Phase transition in fluctuations of interacting spins at infinite temperature
- Author
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Gorshkov, V. N., Sinitsyn, N. A., and Mozyrsky, D.
- Subjects
Condensed Matter - Statistical Mechanics - Abstract
The high temperature limit of interacting spins is usually not associated with ordering or critical phenomena. Nevertheless, spontaneous fluctuations of a local spin polarization at equilibrium have nontrivial dynamics even in this limit. Here, we demonstrate that the spin noise power spectrum of these fluctuations can undergo discontinuous changes as a function of an external magnetic field. As a simple illustration, we consider a model of Ising-like long range spin-spin interactions with a transverse magnetic field as a control parameter. This system undergoes a phase transition associated with disappearance of the noise power peak responsible for the most detrimental decoherence effect of the interactions. \end{abstract}
- Published
- 2023