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Condensed Matter papers — page 113

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Carbon Nanotubes Synthesized in Channels of Alpo4-5 Single Crystals : First X-Ray Scattering Investigations
Following the synthesis of aligned single-wall carbon nanotubes in the channels of AlPO4-5 zeolite single crystals, we present the first X-ray diffraction and diffuse scattering results. They can be…
P. Launois, R. Moret, D. Le Bolloc'h et al.Jun 28, 2000
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Power laws and collapsing dynamics of a trapped Bose-Einstein condensate with attractive interactions
The critical behavior of collective modes and the collapsing dynamics of trapped Bose-Einstein condensates with attractive interactions are studied analytically and numerically. The time scales of…
Hiroki Saito, Masahito UedaJun 27, 2000
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Nucleation of bended vortices in Bose-Einstein condensates in elongated traps
We study the generation of vortices in rotating axially elongated magneto-optical traps, a situation which has been realized in a recent experiment (K. W. Madison, F. Chevy, W. Wohlleben, J.…
J. J. Garcia-Ripoll, V. M. Perez-GarciaJun 27, 2000
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Dephasing times in quantum dots due to elastic LO phonon-carrier collisions
Interpretation of experiments on quantum dot (QD) lasers presents a challenge: the phonon bottleneck, which should strongly suppress relaxation and dephasing of the discrete energy states, often…
A. V. Uskov, A. -P. Jauho, B. Tromborg et al.Jun 26, 2000
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Characteristic Angles in the Wetting of an Angular Region: Surface Shape
The shape of a liquid surface bounded by an acute or obtuse planar angular sector is considered by using classical analysis methods. For acute angular sectors the two principal curvatures are of the…
Yuri O. Popov, Thomas A. WittenJun 24, 2000
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Liquid-liquid equilibrium for monodisperse spherical particles
A system of identical particles interacting through an isotropic potential that allows for two preferred interparticle distances is numerically studied. When the parameters of the interaction…
E. A. JaglaJun 23, 2000
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Correlation gap in the optical spectra of the two-dimensional organic metal (BEDT-TTF)4[Ni(dto)2]
Optical reflection measurements within the highly conducting (a,b)-plane of the organic metal (BEDT-TTF)4[Ni(dto)2] reveal the gradual development of a sharp feature at around 200 cm as the…
P. Haas, E. Griesshaber, B. Gorshunov et al.Jun 23, 2000
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Condensate Oscillations, Kinetic Equations and Two-Fluid Hydrodynamics in a Bose Gas
This is based on 4 lectures given at the 13th Australian Physics Summer School, Australia National University, Canberra, Jan 17-28, 2000. The main topic is the theory of collective modes in a trapped…
Allan GriffinJun 23, 2000
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Freezing of dynamical exponents in low dimensional random media
A particle in a random potential with logarithmic correlations in dimensions d=1,2 is shown to undergo a dynamical transition at Tdyn>0. In d=1 exact results demonstrate that Tdyn=Tc,…
Horacio Castillo, Pierre Le DoussalJun 23, 2000
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Issues, Concepts, and Challenges in Spintronics
We review from a theoretical perspective the emerging field of spintronics where active control of spin transport and dynamics in electronic materials may provide novel device application…
S. Das Sarma, Jaroslav Fabian, Xuedong Hu et al.Jun 23, 2000
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Field-dependence of the Magnetic Relaxation in Mn12-Acetate: A New Form of Spectroscopy
We report point by point measurements below the blocking temperature of the magnetic relaxation of Mn12-acetate as a function of magnetic field applied along the easy axis of magnetization.…
Yicheng Zhong, M. P. Sarachik, Jae Yoo et al.Jun 23, 2000
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Decoherence and long-lived Schroedinger cats in BEC
We consider quantum superposition states in Bose-Einstein condensates. A decoherence rate for the Schrödinger cat is calculated and shown to be a significant threat to this macroscopic quantum…
Diego A. R. Dalvit, Jacek Dziarmaga, Wojciech H. ZurekJun 22, 2000
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Vibration-induced "thermally activated" jamming transition in granular media
The quasi-static frequency response of a granular medium is measured by a forced torsion oscillator method, with forcing frequency fp in the range 10-4 Hz to 5 Hz, while weak vibrations at…
G. D'Anna, G. GremaudJun 21, 2000
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Phase Diagram Structure of the Harper Map
This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.
P. Castelo Ferreira, F. P. Mancini, M. TragtenbergJun 21, 2000
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Supersymmetry in Thermo Field Dynamics
By considering the enlarged thermal system including the heat bath, it is shown that this system has supersymmetry which is not broken at finite temperature. The super algebra is constructed and the…
R. Parthasarathy, R. SridharJun 21, 2000
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Finite-size-scaling analyses of the chiral order in the Josephson-junction ladder with half a flux quantum per plaquette
Chiral order of the Josephson-junction ladder with half a flux quantum per plaquette is studied by means of the exact diagonalization method. We consider an extreme quantum limit where each…
Yoshihiro NishiyamaJun 21, 2000
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Parametrization of Multiple Pathways in Proteins: Fast Folding versus Tight Transitions
Growing experimental evidence shows that proteins follow one or a few distinct paths when folding. We propose in this paper a procedure to parametrize these observed pathways, and from this…
Paul G. Dommersnes, Alex Hansen, Mogens H. Jensen et al.Jun 20, 2000
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Dislocation theory as a 3-dimensional translation gauge theory
We consider the static elastoplastic theory of dislocations in an elastoplastic material. We use a Yang-Mills type Lagrangian (the teleparallel equivalent of Hilbert-Einstein Lagrangian) and some…
Markus LazarJun 19, 2000
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Creep of superconducting vortices in the limit of vanishing temperature: A fingerprint of off-equilibrium dynamics
We theoretically study the creep of vortex matter in superconductors. The low temperatures experimental phenomenology, previously interpreted in terms of ``quantum tunnelling'' of vortices,…
Mario Nicodemi, Henrik Jeldtoft JensenJun 16, 2000
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Compaction of a granular material under cyclic shear
In this paper we present experimental results concerning the compaction of a granular assembly of spheres under periodic shear deformation. The dynamic of the system is slow and continuous when the…
M. Nicolas, P. Duru, O. PouliquenJun 15, 2000
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Unambiguous determination of the g-factor for holes in bismuth at high B/T
Magnetotransport has been investigated in high purity bismuth crystals in static magnetic fields as high as 20 T and temperatures as low as 25 mK. This high B/T ratio permits observation of…
S. G. Bompadre, C. Biagini, D. Maslov et al.Jun 14, 2000
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Net Charge on a Noble Gas Atom Adsorbed on a Metallic Surface
Adsorbed noble gas atoms donate (on the average) a fraction of an electronic charge to the substrate metal. The effect has been experimentally observed as an adsorptive change in the electronic work…
A. Widom, M. S. Tomassone, Y. N. Srivastava et al.Jun 14, 2000
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Non-ergodic effects in the Coulomb glass: specific heat
We present a numerical method for the investigation of non-ergodic effects in the Coulomb glass. For that, an almost complete set of low-energy many-particle states is obtained by a new algorithm.…
A. Díaz-Sánchez, A. Möbius, M. Ortuño et al.Jun 14, 2000
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Thermal operators and cluster topology in q-state Potts Model
We discuss a new class of identities between correlation functions which arise from a local Z2 invariance of the partition function of the q-state Potts model on general graphs or lattices. Their…
M. Caselle, F. Gliozzi, S. NeccoJun 13, 2000
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Coherent dipolar correlations in the ground-state of Kagome frustrated antiferromagnets
We propose a new model for the nature of the low temperature phase of a geometrically frustrated antiferromgnet (AFM) with a Kagome lattice, SrCr8-xGa4+xO19. We propose that the…
Nir GovJun 13, 2000
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