2008

Revaz Ramazashvili 1, 2 Physical Review Letters 101 (2008) 137202 In this article, I study magnetic response of electron wavefunctions in a commensurate collinear antiferromagnet. I show that, at a special set of momenta, hidden anti-unitary symmetry protects Kramers degeneracy of Bloch eigenstates against a magnetic field, pointing transversely to staggered magnetization. Hence a substantial momentum dependence of […]

Fabio Caccioli 1, 2, Silvio Franz 3, Matteo Marsili 4 Journal of Statistical Mechanics: Theory and Experiment (2008) 07006 We consider the coarsening properties of a kinetic Ising model with a memory field. The probability of a spin-flip depends on the persistence time of the spin in a state. The more a spin has been in a given state, the less the

Samir El Shawish 1, Jure Dobnikar 1, Emmanuel Trizac 2 Soft Matter 4 (2008) 1491-1498 Two dimensional suspensions of spherical colloids subject to periodic external fields exhibit a rich variety of molecular crystalline phases. We study in simulations the ground state configurations of dimeric and trimeric systems, that are realized on square and triangular lattices, when either two or three macroions

M. Ferrier 1, A. C. H. Rowe 1, S. Gueron 1, 2, H. Bouchiat 1, C. Texier 1, 3, G. Montambaux 1 Physical Review Letters 100 (2008) 146802 We investigate weak localization in metallic networks etched in a two dimensional electron gas between $25\:$mK and $750\:$mK when electron-electron (e-e) interaction is the dominant phase breaking mechanism. We show that, at the highest temperatures, the contributions arising from trajectories that

Thorsten Emig 1 Journal of Statistical Mechanics: Theory and Experiment (2008) P04007 The interaction of compact objects with an infinitely extended mirror plane due to quantum fluctuations of a scalar or electromagnetic field that scatters off the objects is studied. The mirror plane is assumed to obey either Dirichlet or Neumann boundary conditions or to be perfectly

Michael. R. Peterson 1, Th. Jolicoeur 2, S. Das Sarma 3 Physical Review Letters 101 (2008) 016807 We find the finite-width, i.e., the layer thickness, of experimental quasi-two dimensional systems produces a physical environment sufficient to stabilize the Moore-Read Pfaffian state thought to describe the fractional quantum Hall effect at filling factor $\nu=5/2$. This conclusion is based on exact calculations performed

Brice Chung 1, Thierry Jolicoeur 1 Physical Review A: Atomic, Molecular and Optical Physics 77 (2008) 043608 In the limit of very fast rotation atomic Bose-Einstein condensates may reside entirely in the lowest two-dimensional Landau level (LLL). For small enough filling factor of the LLL, one may have formation of fractional quantum Hall states. We investigate the case of

Dean, D.S., Majumdar, S.N. Physical Review E77 (2008) 0411

Arul Lakshminarayan 1, Steven Tomsovic 1, Oriol Bohigas 2, Satya N. Majumdar 2 Physical Review Letters 100 (2008) 044103 An exact analytical description of extreme intensity statistics in complex random states is derived. These states have the statistical properties of the Gaussian and Circular Unitary Ensemble eigenstates of random matrix theory. Although the components are correlated by the normalization constraint, it is still

John Ardelius 1, Lenka Zdeborová 2 Physica E: Low-dimensional Systems and Nanostructures 78 (2008) 040101 We study geometrical properties of the complete set of solutions of the random 3-satisfiability problem. We show that even for moderate system sizes the number of clusters corresponds surprisingly well with the theoretic asymptotic prediction. We locate the freezing transition in the space of