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Condensed Matter papers — page 109

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Bose-Einstein condensation in trapped bosons: A Variational Monte Carlo analysis
Several properties of trapped hard sphere bosons are evaluated using variational Monte Carlo techniques. A trial wave function composed of a renormalized single particle Gaussian and a hard sphere…
J. L. DuBois, H. R. GlydeAug 24, 2000
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Simulation of Stochastic Volatility using Path Integration: Smiles and Frowns
We apply path integration techniques to obtain option pricing with stochastic volatility using a generalized Black-Scholes equation known as the Merton and Garman equation. We numerically simulate…
Belal E. Baaquie, L. C. Kwek, M. SrikantAug 23, 2000
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Coherent electron-phonon coupling and polaron-like transport in molecular wires
We present a technique to calculate the transport properties through one-dimensional models of molecular wires. The calculations include inelastic electron scattering due to electron-lattice…
H. Ness, S. A. Shevlin, A. J. FisherAug 22, 2000
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Bcc 4He as a Coherent Quantum Solid: "Super-Solid" ?
In this work we investigate the quantum nature of bcc 4He. We show that it is a solid phase with an Off-Diagonal Long Range Order of coherently oscillating local electric dipole moments. These…
Nir GovAug 22, 2000
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Nuclear Spin-Ordering Due to Correlated Atomic Motion in bcc 3He
We propose a new way to treat nuclear magnetism of solid 3He. We argue that the magnetic interaction arises indirectly as a consequence of correlated zero-point motion of the ions. This motion…
N. Gov, E. PolturakAug 22, 2000
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Economics Mapping to the Renormalization Group Scaling of Stock Markets
We make an attempt to map a simple economically motivated model for the price evolution [J. Phys. A: Gen. Math 33, 3637 (2000)] to the phenomenological renormalization group scaling of stock markets.…
E. CanessaAug 21, 2000
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Bag Formation in Quantum Hall Ferromagnets
Charged skyrmions or spin-textures in the quantum Hall ferromagnet at filling factor nu=1 are reinvestigated using the Hartree-Fock method in the lowest Landau level approximation. It is shown that…
Hans WalliserAug 21, 2000
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Segregation transitions in wet granular matter
We report the effect of interstitial fluid on the extent of segregation by imaging the pile that results after bidisperse color-coded particles are poured into a silo. Segregation is sharply reduced…
Azadeh Samadani, A. KudrolliAug 20, 2000
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Multiple energy x-ray holography: the polarization effect
We present the theory for Multiple Energy X-ray Holography (MEXH), using a multipole expansion for the scattered field. We find that light polarization plays a crucial role in the reconstruction of…
V. Bortolani, V. Celli, A. M. MarvinAug 19, 2000
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Exact solutions for interacting boson systems under rotation
We study a class of interacting, harmonically trapped boson systems at angular momentum L. The Hamiltonian leaves a L-dimensional subspace invariant, and this permits an explicit solution of several…
Thomas Papenbrock, George F. BertschAug 18, 2000
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Unique Translation between Hamiltonian Operators and Functional Integrals
A careful treatment of the discretization errors in the path integral formulation of quantum mechanics leads to a unique prescription for the translation from the Hamiltonian to the action in the…
T. Gollisch, C. WetterichAug 18, 2000
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Atomic four-wave mixing: fermions versus bosons
We compare the efficiency of four-wave mixing in quantum degenerate gases of bosonic and fermionic atoms. It is shown that matter-wave gratings formed from either bosonic or fermionic atoms can in…
M. G. Moore, Pierre MeystreAug 17, 2000
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Statics and dynamics of domain patterns in hexagonal-orthorhombic ferroelastics
We study the statics and the dynamics of domain patterns in proper hexagonal-orthorhombic ferroelastics; these patterns are of particular interest because they provide a rare physical realization of…
S. H. Curnoe, A. E. JacobsAug 17, 2000
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Dispersive Lineshape Theory
Motivated by recent experiments we consider a stochastic lineshape theory for the case when the underlying process obeys power-law statistics, based on a generalized Anderson-Kubo oscillator model.…
YounJoon Jung, Eli Barkai, Robert J. SilbeyAug 16, 2000
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Time-reversal symmetry in nonlinear optics
The applicability of time-reversal symmetry to nonlinear optics is discussed, both from macroscopic (Maxwell equations) and microscopic (quantum theoretical) point of view. We find that only spatial…
M. Trzeciecki, W. HübnerAug 16, 2000
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Fragile-strong transitions and polyamorphism in glass former fluids
A simple model of a glass former fluid, consisting of a bidisperse mixture of penetrable spheres is studied. The model shows a transition from fragile to strong behavior as temperature is reduced.…
E. A. JaglaAug 15, 2000
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Excitations of the field-induced soliton lattice in CuGeO3
Here we report the first inelastic neutron scattering study of the magnetic excitations in the incommensurate phase of a spin-Peierls material. The results on CuGeO3 provide direct evidence of a…
M. Enderle, H. M. Roennow, D. F. McMorrow et al.Aug 14, 2000
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Exact solution of a many body problem with nearest and next-nearest neighbour interactions
Recently a partially solvable many-body problem with nearest and next-nearest neighbour interactions is proposed [cond-mat/9904121]. We show that by adding a suitably chosen momentum dependent…
B. Basu-Mallick, Anjan KunduAug 14, 2000
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Phase diagram of congested traffic flow: an empirical study
We analyze traffic data from a highway section containing one effective on-ramp. Based on two criteria, local velocity variation patterns and expansion (or nonexpansion) of congested regions, three…
H. Y. Lee, H. -W. Lee, D. KimAug 11, 2000
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Magnetic transition and polaron crossover in a two-site single polaron model including double exchange interaction
A two-site double exchange model with a single polaron is studied using a perturbation expansion based on the modified Lang-Firsov transformation. The antiferromagnetic to ferromagnetic transition…
Jayita Chatterjee, Manidipa Mitra, A. N. DasAug 10, 2000
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Thermal properties of ferrimagnetic systems
The heat capacity of some ferrimagnets has additional structures like a shoulder in the Schottky-like peak, or emergence of a second peak when an external magnetic field is applied. It is shown here…
Aiman Al-Omari, A. H. NayyarAug 10, 2000
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Combined effect of frustration and dimerization in ferrimagnetic chains and square lattice
Within the zero-temperature linear spin-wave theory we have investigated the effect of frustration and dimerization of a Heisenberg system with alternating spins s1 and s2 on one- and…
Aiman Al-Omari, A. H. NayyarAug 10, 2000
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Diffusion with rearranging traps
A model for diffusion on a cubic lattice with a random distribution of traps is developed. The traps are redistributed at certain time intervals. Such models are useful for describing systems showing…
S. Mandal, R. DasguptaAug 10, 2000
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Hedged Monte-Carlo: low variance derivative pricing with objective probabilities
We propose a new `hedged' Monte-Carlo (HMC) method to price financial derivatives, which allows to determine simultaneously the optimal hedge. The inclusion of the optimal hedging strategy allows…
Marc Potters, Jean-Philippe Bouchaud, Dragan SestovicAug 9, 2000
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About common physical nature of divergence and interference
The difference of actions between nearly lying unstable ``8'' and ``0'' like trajectories in two dimensions is computed by methods of chaotic dynamics. We found it to be equal to…
Daniel L. MillerAug 9, 2000
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