2009

Aleksandra Petkovic 1, Thorsten Emig 1, 2, Thomas Nattermann 1 Physical Review B 79, 22 (2009) 224512 The influence of randomly distributed point impurities and planar defects on order and transport in type-II superconductors and related systems is studied. It is shown that the Bragg glass phase is unstable with respect to planar efects. Even a single weak defect plane oriented parallel […]

Celine Nadal 1, Satya N. Majumdar 1, Massimo Vergassola 2 Physical Review Letters 104 (2009) 110501 Using a Coulomb gas method, we compute analytically the probability distribution of the Renyi entropies (a standard measure of entanglement) for a random pure state of a large bipartite quantum system. We show that, for any order q>1 of the Renyi entropy, there are two

G. Moller 1, Th. Jolicoeur 2, N. Regnault 3 Physical Review A: Atomic, Molecular and Optical Physics 79 (2009) 033609 We study a rapidly rotating gas of unpolarized spin-1/2 ultracold fermions in the two-dimensional regime when all atoms reside in the lowest Landau level. Due to the presence of the spin degree of freedom both s-wave and p-wave interactions are allowed

Christophe Texier 1, Christian Hagendorf 2 Europhysics Letters (EPL) 86 (2009) 37011 A one-dimensional model of classical diffusion in a random force field with a weak concentration $\rho$ of absorbers is studied. The force field is taken as a Gaussian white noise with $\mean{\phi(x)}=0$ and $\mean{\phi(x)\phi(x’)}=g \delta(x-x’)$. Our analysis relies on the relation between the Fokker-Planck operator and a

Stephane Ouvry 1, Alexios P. Polychronakos 2 Journal of Physics A Mathematical and Theoretical 42 (2009) 275302 We consider the one-dimensional Lieb-Liniger model (bosons interacting via 2-body delta potentials) in the infinite coupling constant limit (the so-called Tonks-Girardeau model). This model might be relevant as a description of atomic Bose gases confined in a one-dimensional geometry. It is known

Chepelianskii, A., Mohammad-Raffiee, F., Trizac, E., Raphaël, E. Journal of Physical Chemistry B113 (2009) 3743-3749

T. Fonseca 1, Paul Zinn-Justin 1 Journal of Statistical Mechanics (2009) P03025 We address a number of conjectures about the ground state O(1) loop model, computing in particular two infinite series of partial sums of its entries and relating them to the enumeration of plane partitions. Our main tool is the use of integral formulae for a polynomial solution

V. A. Avetisov 1, A. V. Chertovich 2, S. K. Nechaev 3, 4, O. A. Vasilyev 5, 6 Journal of Statistical Mechanics (2009) P07008 In this paper the question about statistical properties of block–hierarchical random matrices is raised for the first time in connection with structural characteristics of random hierarchical networks obtained by mipmapping procedure. In particular, we compute numerically the spectral density of large

Pasquale Calabrese 1, Raoul Santachiara 2 Journal of statistical mechanics-theory and experiment March 2009, 03 (2009) P03002 We propose a generalization of the replica trick that allows to calculate the large distance asymptotic of off-diagonal correlation functions in anyonic models with a proper factorizable ground-state wave-function. We apply this new method to the exact determination of all the harmonic

Ginestra Bianconi 1, Luca Ferretti 2, Silvio Franz 3 Europhysics Letters (EPL) 87 (2009) 28001 We present a non-neutral stochastic model for the dynamics taking place in a meta-community ecosystems. The model provides a framework for describing the emergence of multiple ecological scenarios and behaves in two extreme limits either as the unified neutral theory of biodiversity or as the Bak-Sneppen