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Apparent nonuniversality in finite segregated tunneling–percolation models

Johner, N.; Grimaldi, C.; Ryser, P. - In: Physica A: Statistical Mechanics and its Applications 374 (2007) 2, pp. 646-654

We investigate the tunneling–percolation mechanism of DC transport nonuniversality for conducting particles of diameter … distribution function has a power-law divergence as g→0, leading to nonuniversal values of the transport exponent. Instead, finite … restricted to a very narrow region around the critical percolation threshold so that, for all practical purposes, DC transport …

Persistent link: https://www.econbiz.de/10011059694

Chaotic Hamiltonian pumps

Dittrich, Thomas; Gutiérrez, Marta; Sinuco, Germán - In: Physica A: Statistical Mechanics and its Applications 327 (2003) 1, pp. 145-150

We present the results of a first exploratory survey of chaotic hamiltonian pumps, constructed as ratchets of finite extension. Two simple models are studied, composed of single or double square potential wells subject to a two-parameter driving that acts on the depth or the position of the...

Persistent link: https://www.econbiz.de/10011060281

Thermoelectric transport properties through a T-shaped single quantum dot

Castellanos, R.; Franco, R.; Silva-Valencia, J.; … - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 24, pp. 5814-5821

We study the thermopower, thermal conductance, electric conductance and the thermoelectric figure of merit for a gate-defined T-shaped single quantum dot (QD). The QD is solved in the limit of strong Coulombian repulsion U→∞, inside the dot, and the quantum wire is modeled on a tight-binding...

Persistent link: https://www.econbiz.de/10011061272

Electron wave packet dynamics in twisted nonlinear ladders with correlated disorder

de Moura, F.A.B.F.; Fulco, U.L.; Lyra, M.L.; … - In: Physica A: Statistical Mechanics and its Applications 390 (2011) 4, pp. 535-540

Within a tight-binding Hamiltonian approach, we study the dynamics of one-electron wave packets in a twisted ladder geometry with adiabatic electron–phonon interaction. The electron–phonon coupling is taken into account in the time-dependent Schrödinger equation through a cubic...

Persistent link: https://www.econbiz.de/10011061433

Ocean circulation and impacts on plankton near the Florida Keys

Willemsen, Jorge F. - In: Physica A: Statistical Mechanics and its Applications 357 (2005) 1, pp. 36-43

the purpose of evaluating the consequences of transport of these components. As a consequence, spatial distributions are …

Persistent link: https://www.econbiz.de/10011063829

Brownian motors possessing internal degree of freedom

Li, Yu-Xiao - In: Physica A: Statistical Mechanics and its Applications 251 (1998) 3, pp. 382-388

The motion of a heavily damped Brownian particle which has an internal degree of freedom is considered. Directed motion of the Brownian particle is generated by external action which acts only on the internal degree of freedom. For a simple case that the internal degree of freedom is rotated...

Persistent link: https://www.econbiz.de/10010599501

Transport and diffusion in overdamped ratchets as a synchronization problem

Zarlenga, D.G.; Larrondo, H.A.; Arizmendi, C.M.; … - In: Physica A: Statistical Mechanics and its Applications 352 (2005) 2, pp. 282-294

The forced and overdamped motion of non-interacting particles in a periodic asymmetric potential is studied. The analysis is focused on synchronization of the motion of the particles with the external sinusoidal driving force. Two cases are considered: a perfect lattice without disorder and a...

Persistent link: https://www.econbiz.de/10010871669

Quantitative comparison of mean field mixing laws for conductivity and dielectric constants of porous media

Widjajakusuma, J.; Biswal, B.; Hilfer, R. - In: Physica A: Statistical Mechanics and its Applications 318 (2003) 3, pp. 319-333

Exact numerical solution of the electrostatic disordered potential problem is carried out for four fully discretized three-dimensional experimental reconstructions of sedimentary rocks. The measured effective macroscopic dielectric constants and electrical conductivities are compared with...

Persistent link: https://www.econbiz.de/10010873735

Effect of shape anisotropy on transport in a two-dimensional computational model: numerical simulations showing experimental features observed in biomembranes

Pradhan, Gauri R; Pandit, Sagar A; Gangal, Anil D; … - In: Physica A: Statistical Mechanics and its Applications 270 (1999) 1, pp. 288-294

We propose a 2-d computational model system comprising a mixture of spheres and the objects of some other shapes, interacting via the Lennard–Jones potential. We propose a reliable and efficient numerical algorithm to obtain void statistics. The void distribution, in turn, determines the...

Persistent link: https://www.econbiz.de/10010874522

Two-stream theory of diffusing light spectroscopies

Durian, D.J. - In: Physica A: Statistical Mechanics and its Applications 229 (1996) 2, pp. 218-235

A theory for the propagation of light through a randomly scattering slab is developed that does not take advantage of a diffusion approximation but can be solved analytically. The treatment allows for scattering anisotropy and boundary reflectivity to be incorporated in a straightforward fashion...

Persistent link: https://www.econbiz.de/10010586577