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Bulletin of the American Physical Society

Non-Stationary Dephasing by a Classical Intermittent Noise

Pascal Degiovanni, David Carpentier, Maxime Clusel, Josef Schriefl

Published Mar 22, 2005• 0 citations
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This thesis deals with different aspects of statistical physics of correlated systems. The first part is related to the fluctuations of global quantities in correlated systems. Various studies clam that such fluctuations are well described by the BHP distribution. We use the 2D Ising model to test and quantify this proposition. Using observations from Monte Carlo simulations, we build a theoretical analysis, showing that the apparent universality of the BHP distribution is related to the Gaussian model obtained from perturbation expansion. Deviations from BHP, due to a non-linear term are expected. In the second part we consider a new model for a 1/f classical intermittent noise and study its effects on the dephasing of a two-level system.Within this model, the evolution of the relative phase between the two states is described as a continuous time random walk. Using renewal theory, we find exact expressions for the dephasing factor and identify the physically relevant various regimes in terms of the coupling to the noise. In particular, we point out the consequences of the non-stationarity and pronounced non-Gaussian features of this noise, including some new anomalous and aging dephasing scenarios. In the last part we present an alternative method to obtain some exact results for the 2D Ising model with a boundary magnetic field, for a finite size system. This method is a generalisation of ideas from Plechko presented for the 2D Ising model in zero field, based on the representation of the Ising model using a Grassmann algebra. A Gaussian 1D action is obtained for a general configuration of the boundary magnetic field. When the magnetic field is homogeneous, our results are in agreement with McCoy and Wu's previous work. This 1D action is used to compute in an efficient way the free energy in a special case of inhomogeneous boundary magnetic field. This allows us to compute the phase diagram of a wetting transition induced by a boundary defect.