Phonon and plasmon excitation in inelastic electron tunneling spectroscopy of graphiteThe inelastic electron tunneling spectrum (IETS)of highly oriented pyrolitic graphite (HOPG) has been measured with scanning tunneling spectroscopy (STS) at 6K. The observed spectral features are in…L. Vitali, M. A. Schneider, K. Kern et al.·Oct 28, 2003SaveLearn
Flow instabilities in complex fluids: Nonlinear rheology and slow relaxationsWe here present two simplified models aimed at describing the long-term, irregular behaviours observed in the rheological response of certain complex fluids, such as periodic oscillations or…A. Aradian, M. E. Cates·Oct 28, 2003SaveLearn
Enhanced transmission and beaming of light via photonic crystal surface modesSurface modes are generally believed to be an undesirable feature of finite photonic crystals (PC), unlike point or line defect modes. However, it is possible to make the surface mode radiate by…Esteban Moreno, F. J. Garcia-Vidal, L. Martin-Moreno·Oct 28, 2003SaveLearn
Transition to hydrodynamics in colliding fermion cloudsWe study the transition from the collisionless to the hydrodynamic regime in a two-component spin-polarized mixture of 40K atoms by exciting its dipolar oscillation modes inside harmonic traps. The…F. Toschi, P. Capuzzi, S. Succi et al.·Oct 28, 2003SaveLearn
Non-Gaussianity of resistance fluctuations near electrical breakdownWe study the resistance fluctuation distribution of a thin film near electrical breakdown. The film is modeled as a stationary resistor networkunder biased percolation. Depending on the value of the…C. Pennetta, E. Alfinito, L. Reggiani et al.·Oct 28, 2003SaveLearn
Bose-Einstein condensates in 1D optical lattices: compressibility, Bloch bands and elementary excitationsWe discuss the Bloch-state solutions of the stationary Gross-Pitaevskii equation and of the Bogoliubov equations for a Bose-Einstein condensate in the presence of a one-dimensional optical lattice.…Meret Kraemer, Chiara Menotti, Lev Pitaevskii et al.·Oct 27, 2003SaveLearn
Characterization of the electronic properties of YB4 and YB6 using 11B NMR and first-principles calculationsTwo compounds, tetragonal YB4 and cubic YB6, have been investigated by electric-field gradient (EFG) and Knight shift measurements at the boron sites using the 11B nuclear magnetic…B. Jäger, S. Paluch, W. Wolf et al.·Oct 25, 2003SaveLearn
Left-Handed-Material-like behavior revealed by arrays of dielectric cylindersWe investigate the electromagnetic propagation in two-dimensional photonic crystals, formed by parallel dielectric cylinders embedded a uniform medium. The transmission of electromagnetic waves…Chao-Hsien Kuo, Zhen Ye·Oct 25, 2003SaveLearn
Ferroelectric Phase Transitions in a Lattice Pseudo-Jahn-Teller ModelA lattice generalization of the (b1u b2g) b3u pseudo-Jahn-Teller model is analyzed within mean-field theory. Ferroelectric or antiferroelectric ground states are found for…Dennis P. Clougherty·Oct 24, 2003SaveLearn
Polarization control of optical transmission of a periodic array of elliptical holes in a metal filmSpectral dependencies of polarized optical transmission of a metal film with a periodic array of elliptical nanoholes have been studied. Such nanostructured metal films exhibit the enhanced broadband…Jill Elliott, Igor I. Smolyaninov, Nikolay I. Zheludev et al.·Oct 24, 2003SaveLearn
Metal-nanoparticle single-electron transistors fabricated using electromigrationWe have fabricated single-electron transistors from individual metal nanoparticles using a geometry that provides improved coupling between the particle and the gate electrode. This is accomplished…K. I. Bolotin, F. Kuemmeth, A. N. Pasupathy et al.·Oct 24, 2003SaveLearn
Magnetization steps in Zn(1-x)MnxO: Four largest exchange constants and single-ion anisotropyMagnetization steps (MST's) from Mn pairs in several single crystals of Zn(1-x)MnxO (0.0056<=x<=0.030, and in one powder (x=0.029), were observed. The largest two exchange constants,…X. Gratens, V. Bindilatti, N. F. Oliveira, et al.·Oct 24, 2003SaveLearn
Magnetization steps in a diluted Heisenberg antiferromagnetic chain: Theory and experiments on TMMC:CdA theory for the equilibrium low-temperature magnetization M of a diluted Heisenberg antiferromagnetic chain is presented. The magnetization curve, M versus B, is calculated using the exact…A. Paduan-Filho, N. F. Oliveira,, V. Bindilatti et al.·Oct 23, 2003SaveLearn
Projection method for rapid ab initio calculations of metalsAn improvement of the Energy Renormalization Group method is proposed for systems with small gap, based on the projection methods developed by H. Feshbach. It is tested for the ground state energy of…A. Kenoufi, J. Polonyi·Oct 23, 2003SaveLearn
Giant Quantum Oscillations of the Longitudinal Magnetoresistance in Quasi two-dimensional MetalsWe have investigated in frame of the quantum transport theory the magnetic quantum oscillations of the longitudinal magnetoresistance ρzz in quasi two-dimensional metals for a magnetic field…T. Champel, V. P. Mineev·Oct 23, 2003SaveLearn
Input and output in damped quantum systems III: Formulation of damped systems driven by Fermion fieldsA comprehensive input-output theory is developed for Fermionic input fields. Quantum stochastic differential equations are developed in both the Ito and Stratonovich forms. The major technical issue…C. W. Gardiner·Oct 23, 2003SaveLearn
Ratcheting of granular materialsWe investigate the quasi-static mechanical response of soils under cyclic loading using a discrete model of randomly generated convex polygons. This response exhibits a sequence of regimes, each one…F. Alonso-Marroquin, H. J. Herrmann·Oct 23, 2003SaveLearn
Superconductor quantum fluid and gravitation field: Can a quantum fluid shield a gravitational field?This paper was withdrawn by the author due to an error in the treatment of the earth acceleration in the accelerated frame of the Cooper pairs.Robert Desbrandes·Oct 23, 2003SaveLearn
Structure Formation, Melting, and the Optical Properties of Gold/DNA Nanocomposites: Effects of Relaxation TimeWe present a model for structure formation, melting, and optical properties of gold/DNA nanocomposites. These composites consist of a collection of gold nanoparticles (of radius 50 nm or less) which…Sung Yong Park, D. Stroud·Oct 22, 2003SaveLearn
Effects of disorder in two-dimensional quantum antiferromagnetsWe study the effects of disorder in two-dimensional quantum antiferromagnets on a square lattice, within the nonlinear sigma model approach, by using of a random distribution of spin stiffnesses or…C. M. S. Conceicao, E. C. Marino·Oct 22, 2003SaveLearn
Electron correlation effects on the dielectric function of liquid metalsThe acoustic excitations of the expanded metal solutions Li-NH3 have been measured by inelastic X-ray scattering as a function of the electron density by changing the Li concentration. The…P. Giura, R. Angelini, C. A. Burns et al.·Oct 22, 2003SaveLearn
Finite-Temperature Order-Disorder Phase Transition in a Cluster Model of Decagonal TilingsIn a recent paper ["Cluster Model of Decagonal Tilings" (to be published in Phys. Rev. B)], we have introduced a cluster model for decagonal tilings in two dimensions. This model is now…Michael Reichert, Franz Gähler·Oct 22, 2003SaveLearn
Cluster Model of Decagonal TilingsA relaxed version of Gummelt's covering rules for the aperiodic decagon is considered, which produces certain random-tiling-type structures. These structures are precisely characterized, along…Michael Reichert, Franz Gähler·Oct 22, 2003SaveLearn
Stark effect of shallow impurities in SiWe have theoretically studied the effect of an electric field on the energy levels of shallow donors and acceptors in silicon. An analysis of the electric field dependence of the lowest energy states…G. D. J. Smit, S. Rogge, J. Caro et al.·Oct 21, 2003SaveLearn
Kibble-Zurek Mechanism in the Ginzburg Regime: Numerical Experiment in the Ising ModelKibble-Zurek mechanism is a theory of defect formation in a non-equilibrium continuous phase transition. So far the theory has been successfully tested by numerical simulations and condensed matter…Jacek Dziarmaga·Oct 21, 2003SaveLearn