The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41We have performed inelastic neutron scattering on a single crystal sample of Sr14Cu24O41 to study the spin dynamics of the Cu2O3 spin ladder layers, and CuO2 chains. Data collected with incident…Roger S Eccleston, Masatomo Uehara, Jun Akimitsu et al.·Nov 6, 1997SaveLearn
Coloring Random TriangulationsWe introduce and solve a two-matrix model for the tri-coloring problem of the vertices of a random triangulation. We present three different solutions: (i) by orthogonal polynomial techniques (ii) by…P. Di Francesco, B. Eynard, E. Guitter·Nov 6, 1997SaveLearn
Wetting of Curved SurfacesAs a first step towards a microscopic understanding of the effective interaction between colloidal particles suspended in a solvent we study the wetting behavior of one-component fluids at spheres…T. Bieker, S. Dietrich·Nov 5, 1997SaveLearn
Global Minima for Transition Metal Clusters Described by Sutton-Chen PotentialsUsing a Monte Carlo minimization approach we report the global minima for metal clusters modelled by the Sutton-Chen family of potentials with N<81, where N is the number of atoms. The resulting…Jonathan Doye, David Wales·Nov 5, 1997SaveLearn
Quantized Scaling of Growing SurfacesThe Kardar-Parisi-Zhang universality class of stochastic surface growth is studied by exact field-theoretic methods. From previous numerical results, a few qualitative assumptions are inferred. In…Michael Lassig·Nov 5, 1997SaveLearn
From one to two dimensions in quantum spin systemsWe study the first derivative of the staggered magnetization squared dm†(θ)2/dθ and the second derivative d2e0(θ)/dθ2 of the ground state energy per site. The parameter θ controls the…A. Fledderjohann, K. -H. Mütter, M. -S. Yang et al.·Nov 4, 1997SaveLearn
Dissipative structure formation in cold-rolled Fe and Ni during heavy ion irradiationWe report 4-probe resistivity measurements of cold-rolled Ni and Fe during 100 MeV oxygen ion irradiation, at 300K. The resistivity shows increase and saturation, marked by jumps. Employing 200 MeV…P. Sen, G. Aggarwal, U. Tiwari·Nov 4, 1997SaveLearn
Continuous measurements in quantum systemsDuring a continuous measurement, quantum systems can be described by a stochastic Schrödinger equation which, in the appropriate limit, reproduces the von Neumann wave-function collapse. The average…Carlo Presilla, Ubaldo Tanbini·Nov 3, 1997SaveLearn
Studies of a 2-Chain Spin Ladder with Frustrating Second Neighbor InteractionsThe Heisenberg model on a 2-chain spin-1/2 ladder with frustrating second neighbor interactions is studied by using series expansions about the Ising and dimer limits, numerical diagonalization, and…Zheng Weihong, V. Kotov, J. Oitmaa·Nov 2, 1997SaveLearn
Anomalous Behavior at a Superconducting Quantum Critical PointMotivated by pressure experiments on UBe13 and Tl2Ba2CaCu2O8, we discuss low-temperature effects of the pairing interaction at a superconducting quantum critical point in a clean system.…Revaz Ramazashvili·Nov 1, 1997SaveLearn
Superconducting Quantum Critical PointWe study the properties of a quantum critical point which develops in a BCS superconductor when pair-breaking suppresses the transition temperature to zero. The pair fluctuations are characterized by…Revaz Ramazashvili, Piers COleman·Nov 1, 1997SaveLearn
Quantum transport in ν=2/3 spin-singlet quantum Hall edgesTunneling conductance G(T) through a constricted point contact is studied for the ν=2/3 spin-singlet edges. Including spin-flip tunneling, Zeeman splitting and random magnetic impurities, we…Ken-ichiro Imura, Naoto Nagaosa·Oct 31, 1997SaveLearn
Extended series expansions for random sequential adsorptionWe express the coverage (occupation fraction) θ, in powers of time t for four models of two-dimensional lattice random sequential adsorption (RSA) to very high orders by improving an algorithm…Chee Kwan Gan, Jian-Sheng Wang·Oct 31, 1997SaveLearn
The liquid-vapor interface of an ionic fluidWe investigate the liquid-vapor interface of the restricted primitive model (RPM) for an ionic fluid using a density-functional approximation based on correlation functions of the homogeneous fluid…B. Groh, R. Evans, S. Dietrich·Oct 30, 1997SaveLearn
A single-electron transistor made from a cadmium selenide nanocrystalThe techniques of colloidal chemistry permit the routine creation of semiconductor nanocrystals, whose dimensions are much smaller than those that can be realized using lithographic techniques. The…David L. Klein, Richard Roth, Andrew K. L. Lim et al.·Oct 30, 1997SaveLearn
Dressed Bose-Einstein Condensates in High-Q CavitiesWe propose and analyze a way in which effective multicomponent condensates can be created inside high-Q multimode cavities. In contrast to the situation involving several atomic species or levels,…E. V. Goldstein, E. M. Wright, P. Meystre·Oct 29, 1997SaveLearn
Solving the Holstein molecular crystal modelWe present selected results for the Holstein molecular crystal model in one space dimension as determined by the Global-Local variational method, including complete polaron energy bands, ground state…Aldo H. Romero, David W. Brown, Katja Lindenberg·Oct 29, 1997SaveLearn
Discrete Scale Invariance and the "Second Black Monday"Evidence is offered for log-periodic (in time) fluctuations in the S&P 500 stock index during the three years prior to the October 27, 1997 "correction". These fluctuations were expected on…James A. Feigenbaum, Peter G. O. Freund·Oct 29, 1997SaveLearn
Magnetic Resonance in the Spin-Peierls compound α'-NaV2O5We present results from magnetic resonance measurements for 75-350 GHz in α'-NaV2O5. The temperature dependence of the integrated intensity indicates that we observe transitions in…S. Schmidt, W. Palme, B. Lüthi et al.·Oct 29, 1997SaveLearn
Nonlinear conductance of nanowires - A signature of Luttinger liquid effects?We analyze recent measurements of the room temperature current-voltage characteristics of gold nanowires, whose zero current conductance is quantized in units of 2e2/h. A faster than linear…M. Jonson, I. V. Krive, P. Sandström et al.·Oct 29, 1997SaveLearn
Generalized-ensemble Monte carlo method for systems with rough energy landscapeWe present a novel Monte Carlo algorithm which enhances equilibrization of low-temperature simulations and allows sampling of configurations over a large range of energies. The method is based on a…Ulrich H. E. Hansmann, Yuko Okamoto·Oct 29, 1997SaveLearn
Field-induced quasi-particle coherence effects in certain small magnetsSmall ferromagnets and anti-ferromagnets with an easy-plane anisotropy have a ground to first excited state (tunnel) splitting which is quasi-periodic in the magnitude of a field applied…S. E. Barnes·Oct 28, 1997SaveLearn
Model for Anisotropic Directed PercolationWe propose a simulation model to study the properties of directed percolation in two-dimensional (2D) anisotropic random media. The degree of anisotropy in the model is given by the ratio μ between…V. Lien Nguyen, Enrique Canessa·Oct 28, 1997SaveLearn
Numerical Analysis of the Bond-Random Antiferromagnetic S=1 Heisenberg ChainGround state of the bond-random antiferromagnetic S=1 Heisenberg chain with the biquadratic interaction -βΣi(Si Si+1)2 is investigated by means of the exact-diagonalization method and the…Yoshihiro Nishiyama·Oct 28, 1997SaveLearn
Gauge-theory approach to planar doped antiferromagnets and external magnetic fieldsA review is given of a relativistic non-Abelian gauge theory approach to the physics of spin-charge separation in doped quantum antiferromagnetic planar systems, proposed recently by the authors.…K. Farakos, N. E. Mavromatos·Oct 27, 1997SaveLearn