publications

Paolo Visco 1, Rosalind J. Allen 1, Satya N. Majumdar 2, Martin R. Evans 1 Biophysical Journal 98 (2010) 1099 Phase variation, or stochastic switching between alternative states of gene expression, is common among microbes, and may be important in coping with changing environments. We use a theoretical model to assess whether such switching is a good strategy for growth in environments with […]

Saburo Higuchi 1, Marc Mézard 2 Journal of Physics 233, 1 (2010) 012003 We study the susceptibility propagation, a message-passing algorithm to compute correlation functions. It is applied to constraint satisfaction problems and its accuracy is examined. As a heuristic method to find a satisfying assignment, we propose susceptibility-guided decimation where correlations among the variables play an important role.

Elia Zarinelli 1, Silvio Franz 1 Journal of statistical mechanics-theory and experiment (2010) P04008 In this paper we study a distance-dependent surface tension, defined as the free-energy cost to put metastable states at a given distance. This will be done in the framework of a disordered microscopic model with Kac interactions that can be solved in the mean-field limit.

Christophe Brun 1, Zhao-Zhong Wang 1, Pierre Monceau 2, Serguei Brazovskii 3 Physical Review Letters 104 (2010) 256403 The two charge-density wave (CDW) transitions in NbSe$_3$ %at wave numbers at $\bm{q_1}$ and $\bm{q_2}$, occurring at the surface were investigated by scanning tunneling microscopy (STM) on \emph{in situ} cleaved $(\bm{b},\bm{c})$ plane. The temperature dependence of first-order CDW satellite spots, obtained from the Fourier transform

Choi, A., Brazovskii, S., and, al. Synthetic Metal160 (2010) 1349-1353

Patricio Leboeuf 1, Simon Moulieras 1 Physical Review Letters 105 (2010) 163904 Superfluidity, the ability of a fluid to move without dissipation, is one of the most spectacular manifestations of the quantum nature of matter. We explore here the possibility of superfluid motion of light. Controlling the speed of a light packet with respect to a defect, we demonstrate

M. V. Feigel’man 1, 2, L. B. Ioffe 1, 3, 4, M. Mézard 3 Physical Review B 82 (2010) 184534 We develop an analytical theory for generic disorder-driven quantum phase transitions. We apply this formalism to the superconductor-insulator transition and we briefly discuss the applications to the order-disorder transition in quantum magnets. The effective spin-1/2 models for these transitions are solved in the cavity

Shayeganfar, F., Jabbari-Farouji, S., Movahed, M.S., Jafari, G.R., Tabar, M.R.R. Physical Review E81 (2010) 061404

Quansheng Ren 1, Kiran M. Kolwankar 1, 2, Areejit Samal 1, 3, Jürgen Jost 1, 4 Physica A: Statistical Mechanics and its Applications 389, 18 (2010) 3900-3914 We study the dynamics of the structure of a formal neural network wherein the strengths of the synapses are governed by spike-timing-dependent plasticity (STDP). For properly chosen input signals, there exists a steady state with a residual network. We

Corinna Kollath 1, Guillaume Roux 2, Giulio Biroli 3, Andreas Laeuchli 4 Journal of Statistical Mechanics (2010) P08011 Motivated by the role that spectral properties play for the dynamical evolution of a quantum many-body system, we investigate the level spacing statistic of the extended Bose-Hubbard model. In particular, we focus on the distribution of the ratio of adjacent level spacings, useful at large