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Condensed Matter papers — page 169

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Fermi Surface as the Driving Mechanism for Helical Antiferromagnetic Ordering in Gd-Y Alloys
The first direct experimental evidence for the Fermi surface (FS) driving the helical antiferromagnetic ordering in a gadolinium-yttrium alloy is reported. The presence of a FS sheet capable of…
H. M. Fretwell, S. B. Dugdale, M. A. Alam et al.Sep 3, 1998
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Polyelectrolyte Solutions with Multivalent Salts
We investigate the thermodynamic properties of a polyelectrolyte solution in a presence of multivalent salts. The polyions are modeled as rigid cylinders with the charge distributed uniformly…
Paulo S. Kuhn, Yan Levin, Marcia C. BarbosaSep 2, 1998
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Exact Large Deviation Function in the Asymmetric Exclusion Process
By an extension of the Bethe ansatz method used by Gwa and Spohn, we obtain an exact expression for the large deviation function of the time averaged current for the fully asymmetric exclusion…
B. Derrida, J. L. LebowitzSep 2, 1998
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On the theory of phase transitions in binary fluid mixtures
The microscopic approach to the description of the phase behaviour and critical phenomena in binary fluid mixtures is proposed. It is based on the method of collective variables with a reference…
O. V. PatsahanSep 2, 1998
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Matter-field theory of the Casimir force
A matter-field theory of the Casimir force is formulated in which the electromagnetic field and collective modes of dielectric media are treated on an equal footing. In our theory, the Casimir force…
Masato Koashi, Masahito UedaSep 2, 1998
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Kink-antikink interactions in the double sine-Gordon equation and the problem of resonance frequencies
We studied the kink-antikink collision process for the "double sine-Gordon" (DSG) equation in 1+1 dimensions at different values of the potential parameter R>0. For small values of R we…
V. A. Gani, A. E. KudryavtsevSep 1, 1998
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Magnetic properties of periodic nonuniform spin-1/2 XX chains in a random Lorentzian transverse field
Using continued fractions we examine the density of states, transverse magnetization and static transverse linear susceptibility of a few periodic nonuniform spin-1/2 XX chains in a random…
Oleg DerzhkoSep 1, 1998
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Classical behavior of a macroscopic Schroedinger cat
We study the dynamics of classical and quantum systems linearly interacting with a classical environment represented by an infinite set of harmonic oscillators. The environment induces a dynamical…
Carlo PresillaSep 1, 1998
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Self-Similar Interpolation in Quantum Mechanics
An approach is developed for constructing simple analytical formulae accurately approximating solutions to eigenvalue problems of quantum mechanics. This approach is based on self-similar…
V. I. Yukalov, E. P. Yukalova, S. GluzmanSep 1, 1998
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Adatom Diffusion at GaN (0001) and (000bar1) Surfaces
The diffusion of Ga and N adatoms has been studied for the technologically relevant wurtzite (000bar1) and (0001) surfaces employing density-functional theory. Our calculations reveal a very…
T. Zywietz, J. Neugebauer, M. SchefflerSep 1, 1998
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Collective excitations in Bose-Einstein condensates in triaxially anisotropic parabolic traps
The wave equation of low-frequency density waves in Bose-Einstein condensates at vanishing temperature in arbitrarily anisotropic harmonic traps is separable in elliptic coordinates, provided the…
András Csordás, Robert GrahamSep 1, 1998
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Competition between spin glass order and strong coupling superconductivity in a single-species fermion model
The phase diagram of a single species fermion model allowing for local pairing superconductivity (SC) and spin glass order (SG) is derived as a function of chemical potential μand ratio r=v/J between…
H. Feldmann, R. OppermannSep 1, 1998
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Critical Behaviour of a Homogeneous Bose Gas at Finite Temperature
A homogeneous non-relativistic Bose gas is investigated at finite temperature using renormalization group methods. The phase transition is shown to be second order and the effective chemical…
Jens O. Andersen, Michael StricklandAug 31, 1998
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Decoherence of Bose-Einstein condensates in traps at finite temperature
The phase diffusion of the order parameter of trapped Bose-Einstein condensates at temperatures large compared to the mean trap frequency is determined, which gives the fundamental limit of the…
Robert GrahamAug 31, 1998
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Low-temperature structural model of hcp solid C70
We report intermolecular potential-energy calculations for solid C70 and determine the optimum static orientations of the molecules at low temperature; we find them to be consistent with the…
G. Ghosh, V. S. Sastry, T. S. RadhakrishnanAug 31, 1998
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Polymers and manifolds in static random flows: a renormalization group study
We study the dynamics of a polymer or a D-dimensional elastic manifold diffusing and convected in a non-potential static random flow (the ``randomly driven polymer model''). We find that…
Kay Joerg Wiese, Pierre Le DoussalAug 30, 1998
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Bunching Transitions on Vicinal Surfaces and Quantum N-mers
We study vicinal crystal surfaces with the terrace-step-kink model on a discrete lattice. Including both a short-ranged attractive interaction and a long-ranged repulsive interaction arising from…
V. B. Shenoy, Shiwei Zhang, W. F. SaamAug 27, 1998
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Comment on "High-Temperature Series Analysis of the 2D Random-Bond Ising Ferromagnet"
A comment on PRL vol. 80, 4697 (1998) by Roder, Adler and Janke. Minior correction included.
Jae-Kwon KimAug 27, 1998
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Analytic computation of the energy levels of a two-dimensional hydrogenic donor in a constant magnetic field
We compute the energy levels of a 2D Hydrogen atom when a constant magnetic field is applied. With the help of a mixed-basis variational method, we calculate the energy eigenvalues of the 1S, 2P- and…
Victor M. Villalba, Ramiro PinoAug 26, 1998
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ac driven sine-Gordon solitons: dynamics and stability
The ac driven sine-Gordon equation is studied analytically and numerically, with the aim of providing a full description of how soliton solutions behave. To date, there is much controversy about when…
Niurka R. Quintero, Angel SanchezAug 26, 1998
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Fractional Populations in Sex-linked Inheritance
We study the fractional populations in chromosome inherited diseases. The governing equations for the fractional populations are found and solved in the presence of mutation and selection. The…
Seung Pyo Lee, Myung-Hoon Chung, Chul Koo Kim et al.Aug 25, 1998
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Photogeneration Dynamics of a Soliton Pair in Polyacetylene
Dynamical process of the formation of a soliton pair from a photogenerated electron-hole pair in polyacetylene is studied numerically by adopting the SSH Hamiltonian. A weak local disorder is…
Yukio Hirano, Yoshiyuki OnoAug 25, 1998
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Coefficient of restitution for elastic disks
We calculate the coefficient of restitution, ε, starting from a microscopic model of elastic disks. The theory is shown to agree with the approach of Hertz in the quasistatic limit, but predicts…
Franz Gerl, Annette ZippeliusAug 24, 1998
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The double-funnel energy landscape of the 38-atom Lennard-Jones cluster
The 38-atom Lennard-Jones cluster has a paradigmatic double-funnel energy landscape. One funnel ends in the global minimum, a face-centred-cubic (fcc) truncated octahedron. At the bottom of the other…
Jonathan Doye, Mark Miller, David WalesAug 24, 1998
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Beyond implied volatility
After a brief review of option pricing theory, we introduce various methods proposed for extracting the statistical information implicit in options prices. We discuss the advantages and drawbacks of…
Rama ContAug 24, 1998
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