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Condensed Matter papers — page 22

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Cooperation and Self-Regulation in a Model of Agents Playing Different Games
A simple model for cooperation between "selfish" agents, which play an extended version of the Prisoner's Dilemma(PD) game, in which they use arbitrary payoffs, is presented and studied.…
H. FortJun 23, 2003
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Transition from Ekman flow to Taylor vortex flow in superfluid helium
By numerically computing the steady axisymmetric flow of helium II confined inside a finite aspect ratio Couette annulus, we determine the transition from Ekman flow to Taylor vortex flow as a…
K. L. Henderson, C. F. BarenghiJun 23, 2003
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Detecting mirror matter on Earth via its thermal imprint on ordinary matter
Mirror matter type dark matter can exist on the Earth's surface, potentially in enhanced concentrations at various anomalous impact sites. Mirror matter fragments can draw in heat from the…
R. Foot, S. MitraJun 23, 2003
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Self-referential behaviour, overreaction and conventions in financial markets
We study a generic model for self-referential behaviour in financial markets, where agents attempt to use some (possibly fictitious) causal correlations between a certain quantitative information and…
Matthieu Wyart, Jean-Philippe BouchaudJun 23, 2003
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Structure and stability of the Si(105) surface
Recent experimental studies have shown that well-annealed, unstrained Si(105) surfaces appear disordered and atomically rough when imaged using scanning tunnelling microscopy (STM). We construct new…
C. V. Ciobanu, V. B. Shenoy, C. Z. Wang et al.Jun 21, 2003
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Anisotropic transport in the two-dimensional electron gas in the presence of spin-orbit coupling
In a two-dimensional electron gas as realized by a semiconductor quantum well, the presence of spin-orbit coupling of both the Rashba and Dresselhaus type leads to anisotropic dispersion relations…
John Schliemann, Daniel LossJun 20, 2003
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Giant lasing effect in magnetic nanoconductors
We propose a new principle for a compact solid-state laser in the 1-100 THz regime. This is a frequency range where attempts to fabricate small size lasers up till now have met severe technical…
A. Kadigrobov, Z. Ivanov, T. Claeson et al.Jun 20, 2003
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Experimental Separation of Rashba and Dresselhaus Spin-Splittings in Semiconductor Quantum Wells
The relative strengths of Rashba and Dresselhaus terms describing the spin-orbit coupling in semiconductor quantum well (QW) structures are extracted from photocurrent measurements on n-type InAs QWs…
S. D. Ganichev, V. V. Bel'kov, L. E. Golub et al.Jun 20, 2003
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Prepyramid-to-pyramid transition of SiGe islands on Si(001)
The morphology of the first three-dimensional islands appearing during strained growth of SiGe alloys on Si(001) was investigated by scanning tunneling microscopy. High resolution images of…
A. Rastelli, H. von Kaenel, B. J. Spencer et al.Jun 19, 2003
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Exact two particle spectrum of the Heisenberg-Peierls chain
The exact solution for the two particle spectrum of the Heisenberg-Peierls one dimensional spin chain is given by working in the fermionic representation. The resulting equations for the eigenvalues…
Julio Abad, J. G. EsteveJun 19, 2003
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Fermionic Atoms in Optical Superlattices
Fermionic atoms in an optical superlattice can realize a very peculiar Anderson lattice model in which impurities interact with each other through a discretized set of delocalized levels. We…
B. Paredes, C. Tejedor, J. I. CiracJun 19, 2003
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Topological thermal instability and the length of proteins
We present an analysis of the role of global topology on the structural stability of folded proteins in thermal equilibrium with a heat bath. For a large class of single domain proteins, we compute…
R. Burioni, D. Cassi, F. Cecconi et al.Jun 19, 2003
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Viscosity models for silicate melts
Rheology of silicates (melts or super cooled as glasses) is one of the most important fields to mankind, as geological activity largely influences life. In this paper, unifying empirical models for…
Jesper deClaville ChristiansenJun 19, 2003
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On the Geometry of Random Networks
The Krakow-Orsay collaboration has applied methods borrowed from equilibrium statistical mechanics and analytic combinatorics to study the geometry of random networks. Results contained in a series…
A. KrzywickiJun 18, 2003
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Evidence for the coexistence of low-dimensional magnetism and long-range order in Ca3CoRhO6
We report the results of neutron powder diffraction studies on the spin-chain compound Ca3CoRhO6 in the temperature range 3 to 293 K. Bragg peaks due to magnetic ordering start appearing below about…
M. Loewenhaupt, W. Schaefer, A. Niazi et al.Jun 18, 2003
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The response of disordered matter to electromagnetic fields
We have studied a variety of different disordered materials, including molecular and ionic liquids, supercooled liquids and glasses, ionic conductors, and doped semiconductors, in ac electromagnetic…
P. Lunkenheimer, A. LoidlJun 18, 2003
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Four-atom period in the conductance of monatomic Al wires
We present first principles calculations based on density functional theory for the conductance of monatomic Al wires between Al(111) electrodes. In contrast to the even-odd oscillations observed in…
K. S. Thygesen, K. W. JacobsenJun 17, 2003
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N identical particles under quantum confinement: A many-body dimensional perturbation theory approach
Systems that involve N identical interacting particles under quantum confinement appear throughout many areas of physics, including chemical, condensed matter, and atomic physics. In this paper, we…
B. A. McKinney, M. Dunn, D. K. Watson et al.Jun 17, 2003
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Fano Lineshapes Revisited: Symmetric Photoionization Peaks from Pure Continuum Excitation
In a photoionization spectrum in which there is no excitation of the discrete states, but only the underlying continuum, we have observed resonances which appear as symmetric peaks, not the commonly…
U. Eichmann, T. F. Gallagher, R. M. KonikJun 16, 2003
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Non-linear Response of the trap model in the aging regime : Exact results in the strong disorder limit
We study the dynamics of the one dimensional disordered trap model presenting a broad distribution of trapping times p(τ) 1/τ1+μ, when an external force is applied from the very beginning…
Cecile MonthusJun 16, 2003
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Electronic structure and optical properties of ZnS/CdS nanoheterostructures
The electronic and optical properties of spherical nanoheterostructures are studied within the semi-empirical sp3s* tight-binding model including the spin-orbit interaction. We use a…
J. Perez-Conde, A. K. BhattacharjeeJun 16, 2003
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Isotopic disorder in Ge single crystals probed with 73Ge NMR
NMR spectra of 73 Ge (nuclear spin I = 9/2) in germanium single crystals with different isotopic compositions have been measured at the frequency of 17.4 MHz at room temperature. Due to the small…
S. V. Verkhovskii, A. Yu. Yakubovsky, B. Z. Malkin et al.Jun 13, 2003
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The Impact of Molecular Polarization on the Electronic Properties of Molecular Semiconductors
In a molecular semiconductor, the carrier is dressed with a polarization cloud that we treat as a quantum field of Frenkel excitons coupled to it. The consequences of the existence of this electronic…
M. N. Bussac, J. D. Picon, L. ZuppiroliJun 13, 2003
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Geometric construction of the Quantum Hall Effect in all even dimensions
The Quantum Hall Effects in all even dimensions are uniformly constructed. Contrary to some recent accounts in the literature, the existence of Quantum Hall Effects does not crucially depend on…
Guowu MengJun 13, 2003
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Comment on "Off-diagonal Long-range Order in Bose Liquids: Irrotational Flow and Quantization of Circulation"
In the context of an application to superfluidity, it is elaborated how to do quantum mechanics of a system with a rotational velocity. Especially, in both the laboratory frame and the non-inertial…
Yu ShiJun 13, 2003
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