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Condensed Matter papers — page 9

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Current suppression in a double-island single-electron transistor for detection of degenerate charge configurations of a floating double-dot
We have investigated a double-island single-electron transistor (DISET) coupled to a floating metal double-dot (DD). Low-temperature transport measurements were used to map out the charge…
R. Brenner, Andrew D. Greentree, A. R. HamiltonOct 21, 2003
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Bose-Einstein transition temperature in a dilute repulsive gas
We discuss certain specific features of the calculation of the critical temperature of a dilute repulsive Bose gas. Interactions modify the critical temperature in two different ways. First, for…
Markus Holzmann, Jean-Noel J. N. Fuchs, Gordon G. Baym et al.Oct 20, 2003
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Apparent hysteresis in a driven system with self-organized drag
Interaction between extended defects and impurities lies at the heart of many physical phenomena in materials science. Here we revisit the ubiquitous problem of the driven motion of an extended…
Mikko Haataja, David J. Srolovitz, Yannis G. KevrekidisOct 20, 2003
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Stochastic Cluster Series expansion for quantum spin systems
In this paper we develop a cluster-variant of the Stochastic Series expansion method (SCSE). For certain systems with longer-range interactions the SCSE is considerably more efficient than the…
Kim Louis, C. GrosOct 20, 2003
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Variational Monte Carlo study of the ground state properties and vacancy formation energy of solid para-H2 using a shadow wave function
A Shadow Wave Function (SWF) is employed along with Variational Monte Carlo techniques to describe the ground state properties of solid molecular para-hydrogen. The study has been extended to…
Francesco Operetto, Francesco PederivaOct 18, 2003
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Spin-polarized transport through a quantum dot coupled to ferromagnetic leads: Kondo correlation effect
We investigate the linear and nonlinear transport through a single level quantum dot connected to two ferromagnetic leads in Kondo regime, using the slave-boson mean field approach for finite on-site…
Jing Ma, Bing Dong, X. L. LeiOct 18, 2003
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Effects of Density of States Asymmetry on Boundary Resistance of Ferromagnetic-Nonferromagnetic Metal Interface
Asymmetry of conduction of electrons in the spin majority and minority bands of a ferromagnetic metal is well known to produce spin accumulation at the boundary with a normal metal when a current is…
Pavel Krotkov, Maxim DzeroOct 17, 2003
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Anomalous Threshold Laws in Quantum Sticking
It has been stated that for a short-ranged surface interaction, the probability of a low-energy particle sticking to a surface always vanishes as s k with k 0 where k=E.…
Dennis P. CloughertyOct 17, 2003
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Band gap or negative refraction effects?
By a rigorous numerical simulation based on the standard multiple scattering theory, we investigate the optical transmission in photonic crystal structures, formed by dielectric cylinders embedded in…
C. -H. Kuo, Z. YeOct 17, 2003
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Broken Symmetry in Density-Functional Theory: Analysis and Cure
We present a detailed analysis of the broken-symmetry mean-field solutions using a four-electron rectangular quantum dot as a model system. Comparisons of the density-functional theory predictions…
A. Harju, E. Rasanen, H. Saarikoski et al.Oct 17, 2003
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Time-Decreasing Hazard and Increasing Time until the Next Earthquake
Contrary to common belief, as the time since the last earthquake in a certain region increases, the risk of occurrence of another earthquake diminishes. As a consequence, the expected waiting time to…
Alvaro CorralOct 17, 2003
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Clustering, advection and patterns in a model of population dynamics with neighborhood-dependent rates
We introduce a simple model of population dynamics which considers birth and death rates for every individual that depend on the number of particles in its neighborhood. The model shows an…
Emilio Hernandez-Garcia, Cristobal LopezOct 16, 2003
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Nonlocal potentials in independent-electron models
This note summarizes the motivation for extending current density-functional theory to include nonlocal one-electron potentials, and proposes methodology for practical calculations. The theoretical…
R. K. NesbetOct 16, 2003
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Elementary excitations in the cyclic molecular nanomagnet Cr8
Combining recent and new inelastic neutron scattering data for the molecular cyclic cluster Cr8 produces a deep understanding of the low lying excitations in bipartite antiferromagnetic Heisenberg…
O. Waldmann, T. Guidi, S. Carretta et al.Oct 16, 2003
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Adiabatic evolution of a coupled-qubit Hamiltonian
We present a general method for studying coupled qubits driven by adiabatically changing external parameters. Extended calculations are provided for a two-bit Hamiltonian whose eigenstates can be…
V. Corato, P. Silvestrini, L. Stodolsky et al.Oct 16, 2003
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A fourth-order time-splitting Laguerre-Hermite pseudo-spectral method for Bose-Einstein condensates
A fourth-order time-splitting Laguerre-Hermite pseudospectral method is introduced for Bose-Einstein condensates (BEC) in 3-D with cylindrical symmetry. The method is explicit, unconditionally…
Weizhu Bao, Jie ShenOct 16, 2003
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A new technique for the sp2/sp3 characterisation of carbon materials
We present a technique to determine the sp3/sp2 ratio of carbon materials which is based on the electron energy-loss spectroscopy and which uses the theoretical spectrum of graphite obtained…
J. Titantah, D. LamoenOct 15, 2003
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The Deviants' Dilemma: A Simple Game in the Run-Up to Seniority
Seniority runs deep. As the saying goes for some conventions or institutions in some societies, seniority exhibits and engulfs into almost all nooks and corners of their organisations. This paper…
A. K. M. Azhar, W. A. T. Wan Abdullah, Z. A. Kidam et al.Oct 15, 2003
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Focussing Light Using Negative Refraction
A slab of negatively refracting material, thickness d, can focus an image at a distance 2d from the object. The negative slab cancels an equal thickness of positive space. This result is a special…
J. B. Pendry, S. Anantha RamakrishnaOct 15, 2003
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Density functional theory calculations of the carbon ELNES of small diameter armchair and zigzag nanotubes: core-hole, curvature and momentum transfer orientation effects
We perform density functional theory calculations on a series of armchair and zigzag nanotubes of diameters less than 1nm using the all-electron Full-Potential(-Linearised)-Augmented-Plane-Wave…
J. T. Titantah, K. Jorissen, D. LamoenOct 15, 2003
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Condensates and correlated boson systems
We study two-body correlations in a many-boson system with a hyperspherical approach, where we can use arbitrary scattering length and include two-body bound states. As a special application we look…
O. Sørensen, D. V. Fedorov, A. S. JensenOct 14, 2003
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Multivariate distribution of returns in financial time series
Multivariate probability density functions of returns are constructed in order to model the empirical behavior of returns in a financial time series. They describe the well-established deviations…
E. Alessio, V. Frappietro, M. I. Krivoruchenko et al.Oct 14, 2003
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Is the Quantum Hall Effect influenced by the gravitational field?
Most of the experiments on the quantum Hall effect (QHE) were made at approximately the same height above sea level. A future international comparison will determine whether the gravitational field…
Friedrich W. Hehl, Yuri N. Obukhov, Bernd RosenowOct 13, 2003
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Domain wall mobility in nanowires: transverse versus vortex walls
The motion of domain walls in ferromagnetic, cylindrical nanowires is investigated numerically by solving the Landau-Lifshitz-Gilbert equation for a classical spin model in which energy contributions…
R. Wieser, U. Nowak, K. D. UsadelOct 13, 2003
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How Do Networks Become Navigable?
Networks created and maintained by social processes, such as the human friendship network and the World Wide Web, appear to exhibit the property of navigability: namely, not only do short paths exist…
Aaron Clauset, Cristopher MooreOct 13, 2003
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