Skip to content

Condensed Matter papers — page 84

cond-matBrowse archive

Response to Invasion by Antigen and Effects of Threshold in an Immune Network Dynamical System Model with a Small Number of Degrees of Freedom
We study a dynamical system model of an idiotypic immune network with a small number of degrees of freedom, mainly focusing on the effect of a threshold above which antibodies can recognise…
Satoko Itaya, Tatsuya UezuJun 29, 2001
Learn
Modelling the structure of clusters of C60 molecules
We locate putative global minima for (C60)N clusters modelled by the potential of Pacheco and Prates-Ramalho up to N=105. These minima are based on icosahedral packing up to N=15, but above this…
Jonathan P. K. Doye, David J. Wales, Wolfgang Branz et al.Jun 29, 2001
Learn
Cold Bose gases with large scattering lengths
We calculate the energy and condensate fraction for a dense system of bosons interacting through an attractive short range interaction with positive s-wave scattering length a. At high densities,…
S. Cowell, H. Heiselberg, I. E. Mazets et al.Jun 29, 2001
Learn
A Distribution of Tunnel Splittings in Mn12-Acetate
In magnetic fields applied parallel to the anisotropy axis, the relaxation of the magnetization of Mn12 measured for different sweep rates is shown to collapse onto a single scaled curve. The…
K. M. Mertes, Yoko Suzuki, M. P. Sarachik et al.Jun 27, 2001
Learn
Statistical Mechanics and Capacity-Approaching Error-Correcting Codes
I will show that there is a deep relation between error-correction codes and certain mathematical models of spin glasses. In particular minimum error probability decoding is equivalent to finding the…
Nicolas SourlasJun 27, 2001
Learn
Heterogeneous Interfacial Failure between Two Elastic Blocks
We investigate numerically the failure process when two elastic media, one hard and one soft that have been glued together thus forming a common interface, are pulled apart. We present three main…
G. George Batrouni, Alex Hansen, Jean SchmittbuhlJun 27, 2001
Learn
Specific Heat upon Aqueous Unfolding of the Protein Interior: A Theoretical Approach
We study theoretically the thermodynamics, over a broad temperature range (5 C to 125 C), related to hydrated water upon protein unfolding. The hydration effect is modeled as interacting dipoles in…
Audun Bakk, Johan S. Hoye, Alex HansenJun 27, 2001
Learn
A theory of ferromagnetism in planar heterostructures of (Mn,III)-V semiconductors
A density functional theory of ferromagnetism in heterostructures of compound semiconductors doped with magnetic impurities is presented. The variable functions in the density functional theory are…
J. Fernandez-Rossier, L. J. ShamJun 26, 2001
Learn
Renormalization Group Approach To Error-Correcting Codes
We explain an algorithm that approximately but efficiently assesses particular parity-check error-correcting codes of large, but finite, blocklength. This algorithm is based on the…
Jonathan Yedidia, Jean-Philippe BouchaudJun 26, 2001
Learn
Separation of time and length scales in spin-glasses: temperature as a microscope
We summarize the different puzzles raised by aging experiments of spin-glasses and their various interpretations. We try to reconcile the `real space', droplet like pictures with the hierarchical…
Jean-Philippe Bouchaud, Vincent Dupuis, Jacques Hammannn et al.Jun 26, 2001
Learn
Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings
We present a systematic study of ground state and spectroscopic properties of many-electron nanoscopic quantum rings. Addition energies at zero magnetic field (B) and electro-chemical potentials as a…
A. Emperador, M. Pi, M. Barranco et al.Jun 26, 2001
Learn
Vortex nucleation and quadrupole deformation of a rotating Bose-Einstein condensate
Using a semi-analytic model based on the Thomas-Fermi approximation, we investigate the relevance of the quadrupole deformation of a trapped Bose-Einstein condensate for the nucleation of quantized…
M. Kraemer, L. Pitaevskii, S. Stringari et al.Jun 26, 2001
Learn
Spontaneous Magnetization of the O(3) Ferromagnet at Low Temperatures
We investigate the low-temperature behavior of ferromagnets with a spontaneously broken symmetry O(3) O(2). The analysis is performed within the perspective of nonrelativistic effective…
Christoph P. HofmannJun 24, 2001
Learn
Anisotropy of Quasiparticle Lifetimes and the Role of Disorder for Ultrafast Electron Dynamics in Graphite
Femtosecond time-resolved photoemission of photoexcited electrons in highly oriented pyrolytic graphite (HOPG) provides strong evidence for anisotropies of quasiparticle (QP) lifetimes. Indicative of…
Gunnar Moos, Cornelius Gahl, Roman Fasel et al.Jun 23, 2001
Learn
Is the particle current a relevant feature in driven lattice gases?
By performing extensive MonteCarlo simulations we show that the infinitely fast driven lattice gas (IDLG) shares its critical properties with the randomly driven lattice gas (RDLG). All the measured…
A. Achahbar, Pedro L. Garrido, J. Marro et al.Jun 22, 2001
Learn
Effective Free Energy of Ginzburg-Landau Model
It is argued that the presence of a nonanalytic term in the effective potential of the Ginzburg-Landau model is immaterial as far as the order of the superconductor-normal phase transition is…
Adriaan M. J. SchakelJun 21, 2001
Learn
Quantum field effects in coupled atomic and molecular Bose-Einstein condensates
This paper examines the parameter regimes in which coupled atomic and molecular Bose-Einstein condensates do not obey the Gross-Pitaevskii equation. Stochastic field equations for coupled atomic and…
J. J. HopeJun 21, 2001
Learn
Statistics of Lyapunov exponent in one-dimensional layered systems
Localization of acoustic waves in a one dimensional water duct containing many randomly distributed air filled blocks is studied. Both the Lyapunov exponent and its variance are computed. Their…
Pi-Gang Luan, Zhen YeJun 20, 2001
Learn
Berry Phases of Classical Trajectories in the Presence of Hard-Wall Boundaries
We study the quantum propagator in the semiclassical limit with hard-wall potentials. We show that, upon each reflection by the hard wall, a Berry phase π is accumulated and leads to interferences…
Hsiu-Hau Lin, Tzay-Ming HongJun 20, 2001
Learn
Avalanches in a Bose-Einstein condensate
Collisional avalanches are identified to be responsible for an 8-fold increase of the initial loss rate of a large 87-Rb condensate. We show that the collisional opacity of an ultra-cold gas exhibits…
J. Schuster, A. Marte, S. Amtage et al.Jun 19, 2001
Learn
Principles of non-local field theories and their application to polymerized membranes
In these lecture notes, we give an overview about non-local field-theories and their application to polymerized membranes, i.e. membranes with a fixed internal connectivity. The main technical tool…
Kay Joerg WieseJun 19, 2001
Learn
Integrability and exact solution of correlated hopping multi-chain electron systems
Exact quantum integrability is established for a class of multi-chain electron models with correlated hopping and spin models with interchain interactions, by constructing the related Lax operators…
Anjan KunduJun 18, 2001
Learn
Bose-Einstein condensation in systems with quadratic energy levels
This paper has been withdrawn by the authors due to substantial changes.
J. M. B. Noronha, D. J. TomsJun 18, 2001
Learn
Cooperation and Surviving with Limited Resources
A network of agents cooperate on a given area. Time evolution of their power is described within a set of nonlinear equations. The limitation of resources is introduced via the Verhulst term,…
K. Malarz, K. KulakowskiJun 18, 2001
Learn
Interaction of an electron gas with photoexcited electron-hole pairs in modulation-doped GaAs and CdTe quantum wells
The nature of the correlated electron gas and its response to photo-injected electron-hole pairs in nominally undoped and modulation-doped multiple quantum-well (MQW) structures was studied by…
H. A. Nickel, T. Yeo, C. J. Meining et al.Jun 14, 2001
Learn
← PreviousPage 84Next →