Hamiltonian structure of thermodynamics with gaugeThe state of a thermodynamic system being characterized by its set of extensive variables qi(i=1,...,n) , we write the associated intensive variables γi, the partial derivatives of the…R. Balian, P. Valentin·Jul 18, 2000SaveLearn
Multiphase segregation and metal-insulator transition in single crystal La(5/8-y)Pr(y)Ca(3/8)MnO3The insulator-metal transition in single crystal La(5/8-y)Pr(y)Ca(3/8)MnO3 with y=0.35 was studied using synchrotron x-ray diffraction, electric resistivity, magnetic susceptibility, and specific…V. Kiryukhin, B. G. Kim, V. Podzorov et al.·Jul 18, 2000SaveLearn
Many-Electron wave function and momentum densitySummary for the review talk on recent progress in the theoretical studies of electron momentum density distribution at the Sagamore XIII conference (Stare Jablonki, Poland; September 3-9, 2000).B. Barbiellini·Jul 18, 2000SaveLearn
Nodal Liquids and DualityUsing a SU(2)x U(1) gauge theory for a t-J model around a node of the Fermi surface, we discuss patterns of dynamical symmetry breaking, which may lead to a pseudogap phase and to the appearance of…Nick E. Mavromatos, Sarben Sarkar·Jul 18, 2000SaveLearn
High frequency resonant experiments in Fe8 molecular clustersPrecise resonant experiments on Fe8 magnetic clusters have been conducted down to 1.2 K at various tranverse magnetic fields, using a cylindrical resonator cavity with 40 different frequencies…E. del Barco, J. M. Hernandez, J. Tejada et al.·Jul 16, 2000SaveLearn
Many-body theory of dilute gas condensates - derivation of a field-modified Gross-Pitaevskii equation from multipolar QEDThe Hamiltonian of a moving atom in electromagnetic fields includes velocity- dependent terms. We show that the leading velocity dependence emerges systematically in the non-relativistic limit from a…L. G. Boussiakou, C. R. Bennett, M. Babiker·Jul 15, 2000SaveLearn
Cationic ordering control of magnetization in Sr2FeMoO6 double perovskiteThe role of the synthesis conditions on the cationic Fe/Mo ordering in Sr2FeMoO6 double perovskite is addressed. It is shown that this ordering can be controlled and varied systematically. The Fe/Mo…Ll. Balcells, J. Navarro, M. Bibes et al.·Jul 14, 2000SaveLearn
Temperature Dependent Scattering Rates at the Fermi Surface of Optimally Doped Bi 2212For optimally doped Bi 2212, scattering rates in the normal state are found to have a linear temperature dependence over most of the Fermi surface. In the immediate vicinity of the (1,0) point, the…T. Valla, A. V. Fedorov, P. D. Johnson et al.·Jul 14, 2000SaveLearn
On the microcanonical solution of a system of globally coupled rotatorsWe study the Hamiltonian Mean Field (HMF) model, a system of N fully coupled particles, in the microcanonical ensemble. We use the previously obtained free energy in the canonical ensemble to…Mickael Antoni, Haye Hinrichsen, Stefano Ruffo·Jul 13, 2000SaveLearn
Excited stationary states of trapped Bose-Einstein condensatesWe investigate the excited stationary states of Bose-Einstein condensates trapped in harmonic potentials. We derive simple analytical approximations of the first few eigenstates of the associated…John A. Vaccaro, Ole Steuernagel, Ben Lorimer·Jul 13, 2000SaveLearn
The dynamics of a hole in a CuO4 plaquette: electron energy-loss spectroscopy of Li2CuO2We have measured the energy and momentum dependent loss function of Li2CuO2 single crystals by means of electron energy-loss spectroscopy in transmission. Using the same values for the model…S. Atzkern, M. Knupfer, M. S. Golden et al.·Jul 13, 2000SaveLearn
A novel method for the extraction of the condensate fraction of liquid 4HeWe present a new, semi-phenomenologocal method to extract the condensate fraction n0(T) from two sets of measured responses of 4He with identical kinematis at T<Tc and T>Tc.A. S. Rinat, M. F. Taragin·Jul 13, 2000SaveLearn
Frequencies and Damping rates of a 2D Deformed Trapped Bose gas above the Critical TemperatureWe derive the equation of motion for the velocity fluctuations of a 2D deformed trapped Bose gas above the critical temperature in the hydrodynamical regime. From this equation, we calculate the…Tarun Kanti Ghosh·Jul 12, 2000SaveLearn
Phase transitions and noise crosscorrelations in a model of directed polymers in a disordered mediumWe show that effective interactions mediated by disorder between two directed polymers can be modelled as the crosscorrelation of noises in the Kardar-Parisi-Zhang (KPZ) equations satisfied by the…Abhik Basu·Jul 12, 2000SaveLearn
Observation of resonance trapping in an open microwave cavityThe coupling of a quantum mechanical system to open decay channels has been theoretically studied in numerous works, mainly in the context of nuclear physics but also in atomic, molecular and…E. Persson, I. Rotter, H. -J. Stoeckmann et al.·Jul 12, 2000SaveLearn
Population dynamics in a random environmentWe investigate the competition between barrier slowing down and proliferation induced superdiffusion in a model of population dynamics in a random force field. Numerical results in d=1 suggest that…Irene Giardina, Jean-Philippe Bouchaud, Marc Mezard·Jul 12, 2000SaveLearn
ab initio modeling of open systems: charge transfer, electron conduction, and molecular switching of a C60 deviceWe present an ab initio analysis of electron conduction through a C60 molecular device. Charge transfer from the device electrodes to the molecular region is found to play a crucial role…Jeremy Taylor, Hong Guo, Jian Wang·Jul 11, 2000SaveLearn
Bose-Einstein condensates in standing waves: The cubic nonlinear Schroedinger equation with a periodic potentialWe present a new family of stationary solutions to the cubic nonlinear Schroedinger equation with a Jacobian elliptic function potential. In the limit of a sinusoidal potential our solutions model a…Jared C. Bronski, Lincoln D. Carr, Bernard Deconinck et al.·Jul 11, 2000SaveLearn
Surface states in nearly modulated systemsA Landau model is used to study the phase behavior of the surface layer for magnetic and cholesteric liquid crystal systems that are at or near a Lifshitz point marking the boundary between modulated…A. E. Jacobs, D. Mukamel, D. W. Allender·Jul 10, 2000SaveLearn
Transport Properties of Highly Aligned Polymer Light-Emitting-DiodesWe investigate hole transport in polymer light-emitting-diodes in which the emissive layer is made of liquid-crystalline polymer chains aligned perpendicular to the direction of transport.…A. Kambili, A. B. Walker·Jul 10, 2000SaveLearn
Overcritical Rotation of a Trapped Bose-Einstein CondensateThe rotational motion of an interacting Bose-Einstein condensate confined by a harmonic trap is investigated by solving the hydrodynamic equations of superfluids, with the irrotationality constraint…A. Recati, F. Zambelli, S. Stringari·Jul 10, 2000SaveLearn
Dimerization of Ferrimagnets on Chains and Square LatticesA linear spin wave analysis of dimerization of alternating Heisenberg system with spins s1 and s2 on linear chain as well as square lattice is presented. Among the several possible…Aiman Al-Omari, A. H. Nayyar·Jul 7, 2000SaveLearn
A protein model exhibiting three folding transitionsWe explain the physical basis of a model for small globular proteins with water interactions. The water is supposed to access the protein interior in an "all-or-none" manner during the…Audun Bakk, Alex Hansen, Kim Sneppen·Jul 7, 2000SaveLearn
Wetting transitions of He4 on alkali metal surfaces from density functional calculationsWe have studied the wetting properties of He4 adsorbed on the surface of heavy alkali metals by using a non-local free-energy density-functional which describes accurately the surface properties of…Francesco Ancilotto, Fabio Faccin, Flavio Toigo·Jul 7, 2000SaveLearn
How to measure the Bogoliubov quasiparticle amplitudes in a trapped condensateWe propose an experiment, based on two consecutive Bragg pulses, to measure the momentum distribution of quasiparticle excitations in a trapped Bose gas at low temperature. With the first pulse one…A. Brunello, F. Dalfovo, L. Pitaevskii et al.·Jul 7, 2000SaveLearn