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Condensed Matter papers — page 14

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Weighted Density Approximation Description of Insulating YH3 and LaH3
Density functional calculations within the weighted density approximation (WDA) are presented for YH3 and LaH3. We investigate some commonly used pair-distribution functions G. These…
Zhigang Wu, R. E. Cohen, D. J. Singh et al.Sep 12, 2003
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Berry's Phases of Ground States of Interacting Spin-One Bosons: Chains of Monopoles and Monosegments
We study Berry's connection potentials of many-body ground states of spin-one bosons with antiferromagnetic interactions in adiabatically varying magnetic fields. We find that Berry's…
Jeroen Wiemer, Fei ZhouSep 12, 2003
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Spontaneous creation of discrete breathers in Josephson arrays
We report on the experimental generation of discrete breather states (intrinsic localized modes) in frustrated Josephson arrays. Our experiments indicate the formation of discrete breathers during…
M. Schuster, F. Pignatelli, A. V. UstinovSep 12, 2003
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AC field induced quantum rectification effect in tunnel junctions
We study the appearance of directed current in tunnel junctions, quantum ratchet effect, in the presence of an external ac field f(t). The current is established in a one-dimensional discrete…
M. V. Fistul, A. E. Miroshnichenko, S. FlachSep 12, 2003
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Who runs fastest in an adaptive landscape: Sexual versus asexual reproduction
We compare the speed with which a sexual, respectively an asexual, population is able to respond to a biased selective pressure. Our model focuses on the Weismann hypothesis that the extra variation…
Kerstin Holmstrom, Henrik Jeldtoft JensenSep 12, 2003
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Site determination and thermally assisted tunneling in homogenous nucleation
A combined low-temperature scanning tunneling microscopy and density functional theory study on the binding and diffusion of copper monomers, dimers, and trimers adsorbed on Cu(111) is presented.…
Jascha Repp, Gerhard Meyer, Karl-Heinz Rieder et al.Sep 11, 2003
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Nonlinear Tight-Binding Approximation for Bose-Einstein Condensates in a Lattice
The dynamics of Bose-Einstein condensates trapped in a deep optical lattice is governed by a discrete nonlinear equation (DNL). Its degree of nonlinearity and the intersite hopping rates are…
Augusto Smerzi, Andrea TrombettoniSep 11, 2003
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The Asakura-Oosawa model in the protein limit: the role of many-body interactions
We study the Asakura-Oosawa model in the "protein limit", where the penetrable sphere radius RAO is much greater than the hard sphere radius Rc. The phase behaviour and structure…
A. Moncho-Jorda, A. A. Louis, P. G. Bolhuis et al.Sep 11, 2003
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Collective modes of a trapped Lieb-Liniger gas: a hydrodynamic approach
We consider a trapped repulsive one-dimensional (1D) Bose gas at very low temperature. In order to study the collective modes of this strongly interacting system, we use a hydrodynamic approach,…
J. N. Fuchs, X. Leyronas, R. CombescotSep 11, 2003
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Quantum Rotation of HCN and DCN in Helium-4
We present calculations of rotational absorption spectra of the molecules HCN and DCN in superfluid helium-4, using a combination of the Diffusion Monte Carlo method for ground state properties and…
R. E. Zillich, K. B. WhaleySep 10, 2003
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Toward a dynamical model for prime numbers
We show one possible dynamical approach to the study of the distribution of prime numbers. Our approach is based on two complexity methods, the Computable Information Content and the Entropy…
Claudio Bonanno, Mirko S. MegaSep 10, 2003
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Percolation of satisfiability in finite dimensions
The satisfiability and optimization of finite-dimensional Boolean formulas are studied using percolation theory, rare region arguments, and boundary effects. In contrast with mean-field results,…
J. M. Schwarz, A. Alan MiddletonSep 10, 2003
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Probing the Electrostatics of Integer Quantum Hall Edges with Momentum-Resolved Tunnel Spectroscopy
We present measurements of momentum-resolved magneto-tunneling from a perpendicular two-dimensional (2D) contact into integer quantum Hall (QH) edges at a sharp edge potential created by cleaved edge…
M. Huber, M. Grayson, D. Schuh et al.Sep 9, 2003
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A fully polarizable and dissociable potential for water
A new classical interaction potential for water simulations is presented. Water is modeled as a fully dissociable set of atoms with a point dipole, determined self-consistently, on every oxygen atom.…
E. Lussetti, G. Pastore, E. SmargiassiSep 9, 2003
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Vibration of the Dimer on Si(001) Surface Excited by STM Current
The vibration of the dimer excited by STM current on Si(001) surface is investigated. We describe this system by the Hamiltonian which has the electron-vibration coupling term as the key ingredient.…
Hiroshi Kawai, Osamu NarikiyoSep 9, 2003
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From Slater to Mott-Heisenberg physics: The antiferromagnetic phase of the Hubbard model
We study the optical conductivity of the one-band Hubbard model in the Néel state at half filling at T=0 using the dynamical mean-field theory. For small values of the Coulomb parameter clear…
Thomas Pruschke, Robert ZitzlerSep 8, 2003
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Absence of magnetic order in Yb3Ga5O12: relation between phase transition and entropy in geometrically frustrated materials
From muon spin relaxation spectroscopy experiments, we show that the sharp peak (lambda type anomaly) detected by specific heat measurements at 54 mK for the ytterbium gallium garnet compound,…
P. Dalmas de Reotier, A. Yaouanc, P. C. M. Gubbens et al.Sep 8, 2003
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Transport properties in Simplified Double Exchange model
Transport properties of the manganites by the double-exchange mechanism are considered. The system is modeled by a simplified double-exchange model, i.e. the Hund coupling of the itinerant electron…
Phan Van-Nham, Tran Minh-TienSep 7, 2003
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A New Analytical Method for Computing Solvent Accessible Surface Area and its Gradients for Macromolecules
In the calculation of thermodynamic properties and three dimensional structures of macromolecules, such as proteins, it is important to have a good algorithm for computing solvent accessible surface…
Shura Hayryan, Chin-Kun Hu, Jaroslav Skřivánek et al.Sep 7, 2003
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Velocity Statistics in the Two-Dimensional Granular Turbulence
We studied the macroscopic statistical properties on the freely evolving quasi-elastic hard disk (granular) system by performing a large-scale (up to a few million particles) event-driven molecular…
Masaharu IsobeSep 6, 2003
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Melting curves and other phase transitions in a two dimensional electron assembly in a transverse magnetic field as a function of the Landau level filling factor
Besides Laughlin/composite Fermion liquid, and Wigner solid, there have been proposals for Hall crystals and condensed phases of skyrmions for inclusion in the QHE systems phase diagram. Some results…
Alejandro Cabo, Francisco Claro, Norman N. MarchSep 6, 2003
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Excitonic Photoluminescence in Semiconductor Quantum Wells: Plasma versus Excitons
Time-resolved photoluminescence spectra after nonresonant excitation show a distinct 1s resonance, independent of the existence of bound excitons. A microscopic analysis identifies excitonic and…
S. Chatterjee, C. Ell, S. Mosor et al.Sep 5, 2003
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Reduction of Magnetic Noise in Magnetic Resonance Force Microscopy
We study the opportunity to reduce a magnetic noise produced by a uniform cantilever with a ferromagnetic particle in magnetic resonance force microscopy (MRFM) applications. We demonstrate…
G. P. Berman, V. N. Gorshkov, V. I. TsifrinovichSep 5, 2003
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Particle rearrangements during transitions between local minima of the potential energy landscape of a supercooled Lennard-Jones liquid
The potential energy landscape (PEL) of supercooled binary Lennard-Jones (BLJ) mixtures exhibits local minima, or inherent structures (IS), which are organized into meta-basins (MB). We study the…
Michael Vogel, Burkhard Doliwa, Andreas Heuer et al.Sep 5, 2003
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Theory of the Optical Properties of a DNA-Modified Gold Nanoparticle System
We describe a simple model for the melting and optical properties of a DNA/gold nanoparticle aggregate. The aggregate is modeled as a cluster of gold nanoparticles on a periodic lattice connected by…
Sung Yong Park, David StroudSep 5, 2003
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