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Condensed Matter papers — page 44

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Social phase transition in Solomon network
In this paper the Solomon network is simulated by means of 1D and 2D Ising model with additional -- not only geometrical -- neighbors. A "social phase transition" at a non-zero Curie-like…
K. MalarzOct 29, 2002
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Magnetic Semiconfinement of Neutral Atoms
A mechanism for creating well-collimated beams of neutral particles or atoms with spins is studied. The consideration is accomplished for a general realistic case, taking into account: (i) the…
V. I. Yukalov, E. P. YukalovaOct 29, 2002
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Formation of InAs Self-Assembled Quantum Rings on InP
Shape transformations of partially capped self-assembled InAs quantum dots grown on InP are studied. Atomic force microscopy images show large anisotropic redistribution of the island material after…
T. Raz, D. Ritter, G. BahirOct 29, 2002
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Low energy monopole Modes of a Trapped atomic Fermi Gas
We consider the low energy collective monopole modes of a trapped weakly interacting atomic Fermi gas in the collisionless regime. The spectrum is calculated for varying coupling strength and…
G. M. BruunOct 29, 2002
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Conductance from Non-perturbative Methods I
We investigate different methods to compute the DC conductance in a quantum wire doped with some impuritied by exploiting the integrability of the theories under consideration. As an essential…
Olalla A. Castro-Alvaredo, Andreas FringOct 28, 2002
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Conductance from Non-perturbative Methods II
This talk provides a natural continuation of the talk presented by Andreas Fring in this conference. Part I was focused on explaining how the DC conductance for a free Fermion theory in the presence…
Olalla A. Castro-Alvaredo, Andreas FringOct 28, 2002
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Ground-state properties of one-dimensional matter and quantum dissociation of a Luttinger liquid
We analyze ground-state properties of strictly one-dimensional molecular matter comprised of identical particles of mass m. Such a class of systems can be described by an additive two-body potential…
Eugene B. Kolomeisky, Xiaoya Qi, Michael TimminsOct 27, 2002
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Ultrasmall In(Ga)As Quantum Dots Grown on Strained GaxIn1-xP Layers
InAs self-assembled quantum dots were grown on strained layers of GaxIn1-xP (0 < x < 0.3) on InP substrates. We show that the quantum dots have narrow vertical dimensions, ranging between 2 to 10…
T. Raz, D. Ritter, G. Bahir et al.Oct 27, 2002
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Statistics of lowest droplets in two-dimensional Gaussian Ising spin glasses
A new approach to determine the value of the zero-temperature thermal exponent theta in spin glasses is presented. It consists in describing the energy level spectrum in spin glasses only in terms of…
Picco Marco, Ritort Felix, Sales MartaOct 25, 2002
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Characterization of large price variations in financial markets
Statistics of drawdowns (loss from the last local maximum to the next local minimum) plays an important role in risk assessment of investment strategies. As they incorporate higher (> two) order…
Anders JohansenOct 25, 2002
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Atom-Atom Scattering Under Cylindrical Harmonic Confinement: Numerical and Analytical Studies of the Confinement Induced Resonance
In a recent article [M. Olshanii, Phys. Rev. Lett. 81, 938 (1998)], an analytic solution of atom-atom scattering with a delta-function pseudopotential interaction in the presence of transverse…
T. Bergeman, M. G. Moore, M. OlshaniiOct 24, 2002
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Microscopic many-body theory of atomic Bose gases near a Feshbach resonance
A Feshbach resonance in the s-wave scattering length occurs if the energy of the two atoms in the incoming open channel is close to the energy of a bound state in a coupled closed channel. Starting…
R. A. Duine, H. T. C. StoofOct 24, 2002
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Nonequilibrium transitions in complex networks: a model of social interaction
We analyze the non-equilibrium order-disorder transition of Axelrod's model of social interaction in several complex networks. In a small world network, we find a transition between an ordered…
Konstantin Klemm, Victor M. Eguiluz, Raul Toral et al.Oct 24, 2002
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Directional Emission from Microlasers with Open Chaotic Resonators
Using topological classical considerations (Poincarè Maps) the appearance of ``bow-tie''-shaped resonances is predicted for certain types of waveguides. The geometry of such waveguides is…
J. A. Méndez-Bermúdez, G. A. Luna-Acosta, P. ŠebaOct 23, 2002
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The New ISIS Instrument Control System
In this paper we present the new PC-VME based data acquisition system which is now being used on the ISIS Engineering diffractometer instrument, ENGIN-X.
F. A. Akeroyd, S. I. Campbell, C. M. Moreton-SmithOct 23, 2002
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Extracting Hidden Symmetry from the Energy Spectrum
In this paper we revisit the problem of finding hidden symmetries in quantum mechanical systems. Our interest in this problem was renewed by nontrivial degeneracies of a simple spin Hamiltonian used…
Emil A. Yuzbashyan, William Happer, Boris L. Altshuler et al.Oct 22, 2002
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Statistical models for company growth
We study Sutton's `microcanonical' model for the internal organisation of firms, that leads to non trivial scaling properties for the statistics of growth rates. We show that the growth rates…
Matthieu Wyart, Jean-Philippe BouchaudOct 22, 2002
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Second-quantized Landau-Zener theory for dynamical instabilities
State engineering in nonlinear quantum dynamics sometimes may demand driving the system through a sequence of dynamically unstable intermediate states. This very general scenario is especially…
J. R. AnglinOct 22, 2002
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Stiffening of fluid membranes due to thermal undulations: density matrix renormalization group study
It has been considered that the effective bending rigidity of fluid membranes should be reduced by thermal undulations. However, recent thorough investigation by Pinnow and Helfrich revealed…
Yoshihiro NishiyamaOct 22, 2002
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Open GENIE - Analysis and Control
Open GENIE is the successor to the widely used and high successful GENIE program that is used as the principal front-end neutron data analysis tool at the ISIS spallation neutron source. In this…
S. I. Campbell, F. A. Akeroyd, C. M. Moreton-SmithOct 22, 2002
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The application of the NeXus data format to ISIS muon data
Although originally designed by and for the use of the Neutron and X-ray communities, the flexibility of the NeXus data format makes it equally suitable for storing data gathered from MuSR…
S. P. Cottrell, D. Flannery, G. Porter et al.Oct 22, 2002
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Instrument Control at the FRM-II using TACO and NICOS
At the new neutron source FRM--II in Garching, Germany, the TACO control system, originally developed at the ESRF in Grenoble, France is used for instrument control purposes. TACO provides an object…
Tobias UnruhOct 22, 2002
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Thermodynamics of a deformed Bose gas
By making use of the double-time Green function technique, we study thermodynamics of a deformed Bose gas, which describes well properties of density intensive photonic gas and radiation fields of…
Zhe Chang, Shao-Xia ChenOct 21, 2002
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openDaVE - a data visualisation and transformation framework
At present each neutron scattering facility has its own set of data treatment software, normally based on a proprietary data format. The travelling scientist is either forced to continually learn new…
Jens KruegerOct 20, 2002
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Instrument Control With TACO at the FRM-II
With the start up of the new German Neutron Source FRM-II in Garching, a common instrument control system has to be installed at the different neutron scattering instruments. With respect to the…
Jens Krueger, Juergen NeuhausOct 20, 2002
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