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Condensed Matter papers — page 110

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Boundary Conditions in Diffusional Growth and Sedimentation
In many applications, transport of particles can be described by the diffusion equation, or its convective-diffusion generalizations, in part of three-dimensional space. In particular, in surface…
Vladimir Privman, Jongsoon ParkAug 7, 2000
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Quantum Dot and Hole Formation in Sputter Erosion
Recently it was experimentally demonstrated that sputtering under normal incidence leads to the formation of spatially ordered uniform nanoscale islands or holes. Here we show that these…
B. Kahng, H. Jeong, A. -L. BarabasiAug 7, 2000
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Power-laws in economy and finance: some ideas from physics
We discuss several models in order to shed light on the origin of power-law distributions and power-law correlations in financial time series. From an empirical point of view, the exponents…
Jean-Philippe BouchaudAug 7, 2000
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The Theory of Atom Lasers
We review the current theory of atom lasers. A tutorial treatment of second quantisation and the Gross-Pitaevskii equation is presented, and basic concepts of coherence are outlined. The generic…
R. Ballagh, C. M. SavageAug 4, 2000
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Enhancement and suppression of spontaneous emission and light scattering by quantum degeneracy
Quantum degeneracy modifies light scattering and spontaneous emission. For fermions, Pauli blocking leads to a suppression of both processes. In contrast, in a weakly interacting Bose-Einstein…
A. Gorlitz, A. P. Chikkatur, W. KetterleAug 3, 2000
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Anomalous scaling in depinning transitions
It is demonstrated that the renormalization group (RG) flows of depinning transitions do not depend on whether the driving force or the system velocity is kept constant. This allows for a comparison…
Onuttom NarayanAug 2, 2000
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Droplet shapes on structured substrates and conformal invariance
We consider the finite-size scaling of equilibrium droplet shapes for fluid adsorption (at bulk two-phase co-existence) on heterogeneous substrates and also in wedge geometries in which only a finite…
A. O. Parry, E. D. Macdonald, C. RasconAug 2, 2000
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The Orbit Space Approach to the Theory of Phase Transitions: The Non-Coregular Case
We consider the problem of the determination of the isotropy classes of the orbit spaces of all the real linear groups, with three independent basic invariants satisfying only one independent…
Gianpaolo ValenteAug 2, 2000
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Direct Observation of the Quantum Energy Gap in S = 1/2 Tetragonal Cuprate Antiferromagnets
Using an electron spin resonance spectrometer covering a wide range of frequency and magnetic field, we have measured the low energy excitations of the S=1/2 tetragonal antiferromagnets,…
K. Katsumata, M. Hagiwara, Z. Honda et al.Aug 1, 2000
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Ferromagnetic ordering in a generalized Hubbard model: weak intra-atomic interaction limit
In the present work ferromagnetic ordering in the Hubbard model generalized by taking into account the inter-atomic exchange interaction and correlated hopping in partially filled narrow band is…
L. DidukhJul 31, 2000
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Ising films with surface defects
The influence of surface defects on the critical properties of magnetic films is studied for Ising models with nearest-neighbour ferromagnetic couplings. The defects include one or two adjacent lines…
M. -C. Chung, M. Kaulke, I. Peschel et al.Jul 31, 2000
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Gauge Invariant Bosonization of Quantum Hall Systems and Skyrmions : Kinematics
We develop a systematic semiclassical approximation scheme for quantum Hall skyrmions near filling factors ν= 1 2n+1, which is exact in the long wavelength limit. We construct a coherent…
Sreedhar B. Dutta, R. ShankarJul 31, 2000
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A simple interpretation of quantum mirages
In an interesting new experiment the electronic structure of a magnetic atom adsorbed on the surface of Cu(111), observed by STM, was projected into a remote location on the same surface. The purpose…
Mariana Weissmann, H. BonadeoJul 28, 2000
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Interactions of several replicas in the random field Ising model
The replicated field theory of the random field Ising model involves the couplings of replicas of different indices. The resulting correlation functions involve a superposition of different types of…
E. Brézin, De DominicisJul 28, 2000
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Regular and Anomalous Quantum Diffusion in the Fibonacci Kicked Rotator
We study the dynamics of a quantum rotator kicked according to the almost-periodic Fibonacci sequence. A special numerical technique allows us to carry on this investigation for as many as 1012…
G. Casati, G. Mantica, D. L. ShepelyanskyJul 27, 2000
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The Structure of a Quantized Vortex in a Bose-Einstein Condensate
The structure of a quantized vortex in a Bose-Einstein Condensate is investigated using the projection method developed by Peierls, Yoccoz, and Thouless. This method was invented to describe the…
Jian-Ming TangJul 27, 2000
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Oscillations of rotating trapped Bose-Einstein condensates
The tensor-virial method is applied for a study of oscillation modes of uniformly rotating Bose-Einstein condensed gases, whose rigid body rotation is supported by an vortex array. The second order…
A. Sedrakian, I. WassermanJul 25, 2000
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Renormalization Group Analysis of a Quivering String Model of Posture Control
Scaling concepts and renormalization group (RG) methods are applied to a simple linear model of human posture control consisting of a trembling or quivering string subject to damping and restoring…
Francisco Alonso-Sanchez, David HochbergJul 25, 2000
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A Waveguide for Bose-Einstein Condensates
We report on the creation of Bose-Einstein condensates of 87Rb in a specially designed hybrid, dipole and magnetic trap. This trap naturally allows the coherent transfer of matter waves into a…
K. Bongs, S. Burger, S. Dettmer et al.Jul 25, 2000
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Coherence Resonance in Chaotic Systems
We show that it is possible for chaotic systems to display the main features of coherence resonance. In particular, we show that a Chua model, operating in a chaotic regime and in the presence of…
C. Palenzuela, R. Toral, C. R. Mirasso et al.Jul 24, 2000
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Composite defect extends cosmology - 3He analogy
Spin-mass vortices have been observed to form in rotating superfluid 3He-B following the absorption of a thermal neutron and a rapid transition from the normal to superfluid state. The spin-mass…
V. B. Eltsov, T. W. B. Kibble, M. Krusius et al.Jul 24, 2000
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Universal correlations of one-dimensional electrons at low density
We summarize results on the asymptotics of the two-particle Green functions of interacting electrons in one dimension. Below a critical value of the chemical potential the Fermi surface vanishes, and…
F. GöhmannJul 20, 2000
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High resolution infrared absorption spectra, crystal field, and relaxation processes in CsCdBr3:Pr3+
High resolution low-temperature absorption spectra of 0.2% Pr3+ doped CsCdBr3 were measured in the spectral region 2000--7000 cm-1. Positions and widths of the crystal field levels within the 3H5,…
M. N. Popova, E. P. Chukalina, B. Z. Malkin et al.Jul 20, 2000
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Vortices observed and to be observed
Linear defects are generic in continuous media. In quantum systems they appear as topological line defects which are associated with a circulating persistent current. In relativistic quantum vacuum…
G. E. VolovikJul 20, 2000
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Lectures on Non Perturbative Field Theory and Quantum Impurity Problems: Part II
These are notes of lectures given at The NATO Advanced Study Institute/EC Summer School on ``New Theoretical Approaches to Strongly Correlated Systems'' (Newton Institute, April 2000). They…
H. SaleurJul 19, 2000
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