Spread of decisions in the corporate board networkBoards of large corporations sharing some of their directors are connected in complex networks. Boards are responsible for corporations' long-term strategy and are often involved in decisions…Stefano Battiston, Gerard Weisbuch, Eric Bonabeau·Dec 9, 2003SaveLearn
Comment on "Observation of Bose-Einstein Condensation of Molecules", cond-mat/0311617In this comment, we argue that the recent experiment of Ketterle and co-workers does not necessarily need to be interpreted as indicating that the true scattering amplitude between two molecules…M. Wouters, J. Tempere, J. T. Devreese·Dec 9, 2003SaveLearn
Surface effects on nanowire transport: numerical investigation using the Boltzmann equationA direct numerical solution of the steady-state Boltzmann equation in a cylindrical geometry is reported. Finite-size effects are investigated in large semiconducting nanowires using the…Venkat S. Sundaram, Ari Mizel·Dec 9, 2003SaveLearn
Simulation of the physical properties of the chalcogenide glass As2S3 using a density-functional-based tight-binding methodWe have used a density-functional-based tight-binding method in order to create structural models of the canonical chalcogenide glass, amorphous (a-)As2S3. The models range from one containing…S. I. Simdyankin, S. R. Elliott, Z. Hajnal et al.·Dec 9, 2003SaveLearn
Exact renormalization group calculation of the shift in Tc for the weakly interacting Bose gasThis paper has been withdrawn by the authors. We have discovered an error in our estimate of c, leading to a larger discrepancy with the exact result. This prevents us to judge the quality of the…J. P Blaizot, R. Mendez-Galain, N. Wschebor·Dec 9, 2003SaveLearn
Order book approach to price impactBuying and selling stocks causes price changes, which are described by the price impact function. To explain the shape of this function, we study the Island ECN orderbook. In addition to transaction…Philipp Weber, Bernd Rosenow·Dec 9, 2003SaveLearn
Rychtmyer-Meshkov instability and solid 4He melting driven by acoustic pulseRecent experiments have shown remarkable dynamics of solid 4He melting and growth, driven by the normal incidence of an acoustic pulse on the solid-liquid interface. The theory of solid…Nir Gov·Dec 9, 2003SaveLearn
Evidence for parametric memory and correlation in semiconductor microcavitiesWe measured the dynamics of polariton parametric stimulated scattering in semiconductor microcavities, by time-resolving the amplified signal with 250 fs resolution. Our experiments demonstrate that…S. Kundermann, M. Saba, C. Ciuti et al.·Dec 8, 2003SaveLearn
Spin diffusion of correlated two-spin states in a dielectric crystalReciprocal space measurements of spin diffusion in a single crystal of calcium fluoride (CaF2) have been extended to dipolar ordered states. The experimental results for the component of the spin…G. S. Boutis, D. Greenbaum, H. Cho et al.·Dec 8, 2003SaveLearn
Families of Matter-Waves for Two-Component Bose-Einstein CondensatesWe produce several families of solutions for two-component nonlinear Schrödinger/Gross-Pitaevskii equations. These include domain walls and the first example of an antidark or gray soliton in the one…P. G. Kevrekidis, H. Nistazakis, D. J. Frantzeskakis et al.·Dec 6, 2003SaveLearn
Transition radiation by matter-wave solitons in optical latticesWe demonstrate that matter-wave solitary pulses formed from Bose condensed atoms moving inside optical lattices continuously radiate dispersive matter waves with prescribed momentum. Our analytical…A. V. Yulin, D. V. Skryabin, P. St. J. Russell·Dec 5, 2003SaveLearn
Path integral formulation of the tunneling dynamics of a superfluid Fermi gas in an optical potentialTo describe the tunneling dynamics of a stack of two-dimensional fermionic superfluids in an optical potential, we derive an effective action functional from a path integral treatment. This effective…M. Wouters, J. Tempere, J. T. Devreese·Dec 5, 2003SaveLearn
Quasi-classical Approach to Bose Condensation in a Finite Potential WellWe treat the problem of self-consistently interacting bosons in the presence of a finite (but macroscopic) potential well within a quasi-classical approximation for the normal component and the order…L. Banyai, A. M. Bundaru, H. Haug·Dec 4, 2003SaveLearn
Dynamics of entanglement in two coupled qubitsConsiderable progress has been made in understanding how dissipation drives the state of a single qubit from a quantum-mechanical superposition to a classical mixed state. This paper uses a…Vivek M. Aji, Joel E. Moore·Dec 4, 2003SaveLearn
Lattice-gas modeling of CO adlayers on Pd(100)Using a lattice-gas model with pairwise interactions, we study the ordered structures, coverage dependence of the heat of adsorption, and other experimentally observable behavior of adsorbed CO…Da-Jiang Liu·Dec 4, 2003SaveLearn
Comment on "Total Negative Refraction in Real Crystals for Ballistic Electrons and Light" (Phys. Rev. Lett. 91, 157404 (2003))Recently, Zhang et al. (Phys. Rev. Lett. 91, 157404 (2003)) have demonstrated that an amphoteric refraction, i. e. both positive and negative refraction, may prevail at the interface of two uniaxial…H. -F. Yau, J. -P. Liu, B. Ke et al.·Dec 4, 2003SaveLearn
A new approach to business fluctuations: heterogeneous interacting agents, scaling laws and financial fragilityIn this paper we discuss a scaling approach to business fluctuations. Our starting point consists in recognizing that concepts and methods derived from physics have allowed economists to (re)discover…Domenico Delli Gatti, Corrado Di Guilmi, Edoardo Gaffeo et al.·Dec 3, 2003SaveLearn
Role of the superexchange interaction in magnetic transition and polaron crossoverThe Hubbard-Holstein model is studied including double-exchange interaction and superexchange interaction using a variational phonon basis obtained through the modified Lang-Firsov (MLF)…Jayita Chatterjee, A. N. Das·Dec 3, 2003SaveLearn
Effective collective barrier for magnetic relaxation in frozen ferrofluidsMagnetic relaxation and frequency response were measured in frozen ferrimagnetic colloids of different concentrations. A crossover from reversible to irreversible behavior is observed for…Ruslan Prozorov, Tanya Prozorov, Alexey Snezhko·Dec 3, 2003SaveLearn
Pressure effects on charge, spin, and metal-insulator transitions in narrow bandwidth manganite Pr1-xCaxMnO3Pressure effects on the charge and spin states and the relation between the ferromagnetic and metallic states were explored on the small bandwidth manganite Pr1-xCaxMnO3 (x = 0.25,…Congwu Cui, Trevor A. Tyson·Dec 3, 2003SaveLearn
Nonextensive information entropy for stochastic networksNature is full of random networks of complex topology describing such apparently disparate systems as biological, economical or informatical ones. Their most characteristic feature is the apparent…G. Wilk, Z. Wlodarczyk·Dec 3, 2003SaveLearn
The Efficiency of Defect Production in Planar Superconductors and Liquid CrystalsA recent experiment that sees the spontaneous creation of magnetic flux on quenching high-Tc films has shown that earlier null results were a consequence of the lack of saturation of the…R. J. Rivers, A. Swarup·Dec 2, 2003SaveLearn
On the derivation of amplitude equations for nonlinear oscillators subject to arbitrary forcingBy using a generalization of the multiple scales technique we develop a method to derive amplitude equations for zero--dimensional forced systems. The method allows to consider either additive or…R. Toral, C. Mayol, C. Mirasso·Dec 2, 2003SaveLearn
The Boson peak and the phonons in glassesDespite the presence of topological disorder, phonons seem to exist also in glasses at very high frequencies (THz) and they remarkably persist into the supercooled liquid. A universal feature of such…S. Ciliberti, T. S. Grigera, V. Martin-Mayor et al.·Dec 2, 2003SaveLearn
Averaging For Solitons With Nonlinearity ManagementWe develop an averaging method for solitons of the nonlinear Schrödinger equation with periodically varying nonlinearity coefficient. This method is used to effectively describe solitons in…D. E. Pelinovsky, P. G. Kevrekidis, D. J. Frantzeskakis·Dec 2, 2003SaveLearn