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Condensed Matter papers — page 81

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"Supersolid" self-bound Bose condensates via laser-induced interatomic forces
We show that the dipole-dipole interatomic forces induced by a single off-resonant running laser beam can lead to a self-bound pencil-shaped Bose condensate, even if the laser beam is a plane-wave.…
S. Giovanazzi, D. O'Dell, G. KurizkiAug 2, 2001
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Many-body Diagrammatic Expansion for the Exchange-Correlation Kernel in Time-Dependent Density Functional Theory
A diagrammatic expansion for the dynamic exchange-correlation kernel fxc of time dependent density functional theory is formulated. It is shown that fxc has no singularities at Kohn-Sham transition…
I. V. Tokatly, R. Stubner, O. PankratovAug 1, 2001
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Patterns, Trends and Predictions in stock market indices and foreign currency exchange rates
Specialized topics on financial data analysis from a numerical and physical point of view are discussed. They pertain to the analysis of crash prediction in stock market indices and to the…
M. Ausloos, K. IvanovaAug 1, 2001
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Percolation in real Wildfires
This paper focuses on the statistical properties of wild-land fires and, in particular, investigates if spread dynamics relates to simple invasion model. The fractal dimension and lacunarity of three…
Guido Caldarelli, Raffaella Frondoni, Andrea Gabrielli et al.Aug 1, 2001
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Conformal lattice of magnetic bubble domains in garnet film
We report experimental observations of magnetic bubble domain arrays with no apparent translational symmetry. Additionally the results of comparative numerical studies are discussed. Our goal is to…
M. Gutowski, K. Piotrowski, M. Gutowska et al.Aug 1, 2001
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Low energy Collective Modes of a Superfluid Trapped atomic Fermi Gas
We consider the low energy collective mode spectrum of a superfluid Fermi gas in a spherical trap in the collisionless regime. Using a self-consistent random-phase approximation, the effects of…
G. M. Bruun, B. R. MottelsonJul 31, 2001
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Stress response function of a granular layer: quantitative comparison between experiments and isotropic elasticity
We measured the vertical pressure response function of a layer of sand submitted to a localized normal force at its surface. We found that this response profile depends on the way the layer has been…
D. Serero, G. Reydellet, P. Claudin et al.Jul 31, 2001
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Spin susceptibility of the superfluid 3He-B in aerogel
The temperature dependence of paramagnetic susceptibility of the superfluid 3He-B in aerogel is found. Calculations have been performed for an arbitrary phase shift of s-wave scattering in the…
V. P. Mineev, P. L. KrotkovJul 30, 2001
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Growing Scale-Free Networks with Small World Behavior
In the context of growing networks, we introduce a simple dynamical model that unifies the generic features of real networks: scale-free distribution of degree and the small world effect. While the…
Konstantin Klemm, Victor M. EguiluzJul 30, 2001
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Highly clustered scale-free networks
We propose a model for growing networks based on a finite memory of the nodes. The model shows stylized features of real-world networks: power law distribution of degree, linear preferential…
Konstantin Klemm, Victor M. EguiluzJul 30, 2001
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Pressure-induced Superconductivity in a Ferromagnet UGe2 -- Resistivity Measurements in Magnetic Field --
The electrical resistivity measurements in the magnetic field are carried out on the pressure-induced superconductor UGe2. The superconductivity is observed from 1.06 to 1.44 GPa. The upper…
T. C. Kobayashi, K. Hanazono, N. Tateiwa et al.Jul 29, 2001
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Noncollinear Ferromagnetism in (III,Mn)V Semiconductors
We investigate the stability of the collinear ferromagnetic state in kinetic exchange models for (III,Mn)V semiconductors with randomly distributed Mn ions >. Our results suggest that …
John Schliemann, A. H. MacDonaldJul 27, 2001
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Green fluorescent proteins as optically-controllable elements in bioelectronics
A single-biomolecule optical toggle-switch is demonstrated based on a mutated green fluorescent protein (GFP). We have exploited molecular biology techniques to tailor GFP molecular structure and…
Riccardo A. G. Cinelli, Vittorio Pellegrini, Aldo Ferrari et al.Jul 27, 2001
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Nonlinear coupling between scissors modes of a Bose-Einstein condensate
We explore the nonlinear coupling of the three scissors modes of an anisotropic Bose-Einstein condensate. We show that only when the frequency of one of the scissors modes is twice the frequency of…
U. Al Khawaja, H. T. C. StoofJul 27, 2001
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Direct Investigation of Superparamagnetism in Co Nanoparticle Films
A direct probe of superparamagnetism was used to determine the complete anisotropy energy distribution of Co nanoparticle films. The films were composed of self-assembled lattices of uniform Co…
S. I. Woods, J. R. Kirtley, Shouheng Sun et al.Jul 26, 2001
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Electron transport in the dye sensitized nanocrystalline cell
Dye sensitised nanocrystalline solar cells (Grätzel cells) have achieved solar-to-electrical energy conversion efficiencies of 12% in diffuse daylight. The cell is based on a thin film of…
A Kambili, A B Walker, F Qiu et al.Jul 26, 2001
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Mirror Options
In this work we present a new family of options (mirror options) specially crafted to satisfy the necessities of aggressive speculators. The main ideas behind mirror options are: 1) A product that…
Julian ManzanoJul 26, 2001
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Electrical Properties of Crystalline Ba0.5Sr0.5TiO3 Thin Films
Thin Ba0.5Sr0.5TiO3 (BST) films on p-type Si (100) using The Chemical Solution Deposition (CSD) method. X-ray diffraction (XRD), Scanning electron microscopy (SEM), C-V meter analysis measurement…
Irzaman, H. Darmasetiawan, M. Nur Indro S. G. Sukaryo et al.Jul 26, 2001
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Dynamics of thermal Bose fields in the classical limit
We develop an approximate formalism suitable for performing simulations of the thermal dynamics of interacting Bose gases. The method is based on the observation that when the lowest energy modes of…
M. J. Davis, R. J. Ballagh, K. BurnettJul 25, 2001
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Wavepacket diffraction in the Kronig-Penney model
The phenomenon of wavepacket diffraction in space and time is investigated numerically and analytically, for a one-dimensional array of equally spaced finite-depth wells. Theoretical predictions for…
G. KälbermannJul 25, 2001
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Crystal Symmetry and Time Scales
The relation between the notion of crystalline symmetry and characteristic time intervals when this symmetry could be observed is analyzed. Several time scales are shown to exist for a system of…
V. I. Yukalov, E. P. YukalovaJul 25, 2001
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Vortex bending and tightly packed vortex lattices in Bose-Einstein condensates
We study in detail the counterintuitive result that in elongated rotating Bose--Einstein condensates the ground state is composed of one or more vortex lines which bend even in completely symmetric…
J. J. Garcia-Ripoll, V. M. Perez-GarciaJul 25, 2001
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Multiresolution analysis for efficient, high precision all-electron density-functional calculations
Multiresolution analysis of electronic structure affords the opportunity to capture the full physics of atomic cores in a systematically improvable manner. Applying new techniques, we demonstrate for…
Torkel D. Engeness, T. A. AriasJul 23, 2001
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Spin sensitive bleaching and monopolar spin orientation in quantum wells
Spin sensitive bleaching of the absorption of far-infrared radiation has been observed in p-type GaAs/AlGaAs quantum well structures. The absorption of circularly polarized radiation saturates at…
S. D. Ganichev, S. N. Danilov, V. V. Bel'kov et al.Jul 23, 2001
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Experimental Observation of Coherence and Stochastic Resonances in an Electronic Chua Circuit
Stochastic and coherence resonances appear in nonlinear systems subjected to an external source of noise and are characterized by a maximum response at the optimal value of the noise intensity. This…
O. Calvo, I. Gomes, C. R. Mirasso et al.Jul 23, 2001
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