Field Theory of N Entangled PolymersWe formulate a field theory capable of describing the entanglement in a canonical ensemble of N polymers in terms of Feynman diagrams.Franco Ferrari, Hagen Kleinert, Ignazio Lazzizzera·May 18, 2000SaveLearn
Fredholm determinant representation for the partition function of the six-vertex modelThe six-vertex model with domain wall boundary conditions is considered. A Fredholm determinant representation for the partition function of the model is obtained. The kernel of the corrtesponding…N. A. Slavnov·May 18, 2000SaveLearn
Enhanced Spin Polarization of Conduction Electrons in Ni, explained by comparison with CuThe spin-split Fermi level crossings of the conduction band in Ni are mapped out by high-resolution photoemission and compared to the equivalent crossing in Cu. The area of the quasiparticle peak…K. N. Altmann, D. Y. Petrovykh, G. J. Mankey et al.·May 18, 2000SaveLearn
Third Order Renormalization Group applied to the attractive one-dimensional Fermi GasWe consider a Callan-Symanzik and a Wilson Renormalization Group approach to the infrared problem for interacting fermions in one dimension with backscattering. We compute the third order (two-loop)…Paolo Carta·May 17, 2000SaveLearn
NMR Spectroscopy and the Crystal-Field Interaction in Holmium TrifluorideThe work to be described falls into three parts: (1) The computer-controlled CW spectrometer was designed to supplement the Manchester pulsed microwave spectrometer in situations where rapid nuclear…Simeon Warner·May 16, 2000SaveLearn
Relation between Raman spectra and Structure of Amorphous SiliconIn 1985, Beeman, Tsu and Thorpe established an almost linear relation between the Raman transverse-optic (TO) peak width and the spread in mean bond angle in a-Si. This relation is often used to…R. L. C. Vink, G. T. Barkema, W. F. van der Weg·May 16, 2000SaveLearn
Complete determination of the reflection coefficient in neutron specular reflection by absorptive non-magnetic mediaAn experimental method is proposed which allows the complete determination of the complex reflection coefficient for absorptive media for positive and negative values of the momenta. It makes use of…H. Leeb, H. Groetz, J. Kasper et al.·May 15, 2000SaveLearn
Exact Eigenstates for Repulsive Bosons in Two DimensionsWe consider a model of N two-dimensional bosons in a harmonic potential with weak repulsive delta-function interactions. We show analytically that, for angular momentum L N, the elementary…R A Smith, N K Wilkin·May 14, 2000SaveLearn
Temperature and Angular Dependence of the Magnetoresistance in Low Dimensional Organic MetalsDetailed studies of the magnetoresistance of alpha-(ET)2KHg(SCN)4 and alpha-(ET)2TlHg(SCN)4 as a function of temperature, magnetic field strength, and field orientation are reported. Below 15 K, the…J. S. Qualls, J. S. Brooks, S. Uji et al.·May 12, 2000SaveLearn
Massive skyrmions in quantum Hall ferromagnetsWe apply the theory of elasticity to study the effects of skyrmion mass on lattice dynamics in quantum Hall systems. We find that massive Skyrme lattices behave like a Wigner crystal in the presence…M. Abolfath, Kieran Mullen, H. T. C. Stoof·May 11, 2000SaveLearn
Liquid-Solid Transition of Hard Spheres Under GravityWe investigate the liquid-solid transition of two dimensional hard spheres in the presence of gravity. We determine the transition temperature and the fraction of particles in the solid regime as a…Paul V. Quinn, Daniel C. Hong·May 11, 2000SaveLearn
Aging and Non Linear Glassy Dynamics in a Mean-Field ModelThe mean-field dynamics of a particle in a random, but short range correlated potential, offers the opportunity of observing both aging and driven stationary regimes. Using a geometrical approach…Fabrice Thalmann·May 9, 2000SaveLearn
Geometrical Approach for the Mean-Field Dynamics of a Particle in a Short Range Correlated Random PotentialThe zero temperature relaxational dynamics of a particle in a short range correlated random potential is addressed. We derive a set of "two-times" mean-field dynamical equations, accounting…Fabrice Thalmann·May 9, 2000SaveLearn
Analytical results for a trapped, weakly-interacting Bose-Einstein condensate under rotationWe examine the problem of a repulsive, weakly-interacting and harmonically trapped Bose-Einstein condensate under rotation. We derive a simple analytic expression for the energy incorporating the…A. D. Jackson, G. M. Kavoulakis·May 9, 2000SaveLearn
Crowd-anticrowd theory of the Minority GameThe Minority Game is a simple yet highly non-trivial agent-based model for a complex adaptive system. Despite its importance, a quantitative explanation of the game's fluctuations which applies…M. Hart, P. Jefferies, N. F. Johnson et al.·May 9, 2000SaveLearn
Hedging large risks reduces the transaction costsAs soon as one accepts to abandon the zero-risk paradigm of Black-Scholes, very interesting issues concerning risk control arise because different definitions of the risk become unequivalent. Optimal…Farhat Selmi, Jean-Philippe Bouchaud·May 9, 2000SaveLearn
Generation and evolution of vortex-antivortex pairs in Bose-Einstein condensatesWe propose a method for generating and controlling a spatially separated vortex--antivortex pair in a Bose-Einstein condensate trapped in a toroidal potential. Our simulations of the time dependent…J. -P. Martikainen, K. -A. Suominen, L. Santos et al.·May 8, 2000SaveLearn
Interaction-induced Bose Metal in 2DWe show here that the regularization of the conductivity resulting from the bosonic interactions on the `insulating' (quantum disordered) side of an insulator-superconductor transition in 2D…Denis Dalidovich, Philip Phillips·May 5, 2000SaveLearn
Analysis of Dislocation Mechanism for Melting of Elements: Pressure DependenceIn the framework of melting as a dislocation-mediated phase transition we derive an equation for the pressure dependence of the melting temperatures of the elements valid up to pressures of order…Leonid Burakovsky, Dean L. Preston, Richard R. Silbar·May 5, 2000SaveLearn
Deviations from linear theory for fluctuations below the supercritical primary bifurcation to electroconvectionWe report measurements of thermally-induced mean-square director-angle fluctuations <theta2> below primary supercritical bifurcations to electroconvection of the nematic liquid crystals I52 and…Michael A. Scherer, Guenter Ahlers, Frank Hoerner et al.·May 5, 2000SaveLearn
Local magnetism of isolated Mo atoms at substitutional and interstitial sites in Yb metal : Experiment and TheoryUsing TDPAD experiment and local spin density calculations, we have observed large 4d moments on isolated Mo atoms at substitutional and octahedral interstitial lattice sites in Yb metal, showing…A. A. Tulapurkar, S. N. Mishra, R. G. Pillay et al.·May 4, 2000SaveLearn
Direct measurement of polaron binding energy in AMnO3 as a function of the A site ionic size by photoinduced IR absorptionPhotoinduced IR absorption was measured in undoped (LaMn)1-δO3 and (NdMn)1-δO3. We observe broadening and a ~44% increase of the midinfrared anti-Jahn-Teller polaron peak energy when…T. Mertelj, M. Hrovat, D. Kuščer et al.·May 4, 2000SaveLearn
Phases of a Stack of Membranes at Large-dThe phase diagram of a stack of tensionless membranes with nonlinear curvature energy and vertical harmonic interaction is calculated exactly in a large number of dimensions of configuration space.…M. E. S. Borelli, H. Kleinert·May 4, 2000SaveLearn
The doping dependence of T* - what is the real high-Tc phase diagram?Underdoped high-Tc superconductors are frequently characterised by a temperature, T*, below which the normal-state pseudogap opens. Two different "phase diagrams" based on the doping (p)…J. L. Tallon, J. W. Loram·May 3, 2000SaveLearn
Impurity Scattering from δ-layers in Giant Magnetoresistance SystemsThe properties of the archetypal Co/Cu giant magnetoresistance (GMR) spin-valve structure have been modified by the insertion of very thin (sub-monolayer) δ-layers of various elements at different…C. H. Marrows, B. J. Hickey·May 3, 2000SaveLearn