scholarly journals Ordering near the percolation threshold in models of two-dimensional interacting bosons with quenched dilution

2006 ◽  
Vol 73 (6) ◽  
Author(s):  
N. Bray-Ali ◽  
J. E. Moore ◽  
T. Senthil ◽  
A. Vishwanath
Keyword(s):  
Percolation Threshold ◽  
Two Dimensional

Transition to chaotization and loss of self-averagability in two-dimensional two-phase media at the percolation threshold

1999 ◽  
Vol 44 (4) ◽  
pp. 458-461 ◽  
Author(s):  
S. P. Luk’yanets ◽  
A. E. Morozovskii ◽  
A. A. Snarkskii
Keyword(s):  
Percolation Threshold ◽  
Two Dimensional ◽  
Two Phase ◽  
Loss Of Self

A CORRELATION BETWEEN PERCOLATION MODEL AND ISING MODEL

1996 ◽  
Vol 07 (04) ◽  
pp. 609-612 ◽  
Author(s):  
R. HACKL ◽  
I. MORGENSTERN
Keyword(s):  
Critical Temperature ◽  
Ising Model ◽  
Percolation Threshold ◽  
Higher Dimensions ◽  
Percolation Model ◽  
Critical Values ◽  
Square Lattice ◽  
Approximation Formula ◽  
Two Dimensional

In this article we will expose a connection between critical values of percolation and Ising model, i.e., the percolation threshold pc, and the critical temperature Tc and energy Ec, respectively, by the approximation [Formula: see text]. For the two-dimensional square lattice even the identity holds. For higher dimensions — up to d = 7 — and other lattice types we find remarkably small differences from one to five percent.

The combined hydrodynamic and thermodynamic effects of immobilized proteins on the diffusion of mobile transmembrane proteins

2019 ◽  
Vol 877 ◽  
pp. 648-681
Author(s):  
Rohit R. Singh ◽  
Ashok S. Sangani ◽  
Susan Daniel ◽  
Donald L. Koch
Keyword(s):  
Percolation Threshold ◽  
Stokes Equations ◽  
Volume Fraction ◽  
Transmembrane Proteins ◽  
Hydrodynamic Interactions ◽  
Steric Effects ◽  
Two Dimensional ◽  
Long Time ◽  
Short Time ◽  
Mobile Protein

The plasma membranes of cells are thin viscous sheets in which some transmembrane proteins have two-dimensional mobility and some are immobilized. Previous studies have shown that immobile proteins retard the short-time diffusivity of mobile particles through hydrodynamic interactions and that steric effects of immobile proteins reduce the long-time diffusivity in a model that neglects hydrodynamic interactions. We present a rigorous derivation of the long-time diffusivity of a single mobile protein interacting hydrodynamically and thermodynamically with an array of immobile proteins subject to periodic boundary conditions. This method is based on a finite element method (FEM) solution of the probability density of the mobile protein diffusing with a position-dependent mobility determined through a multipole solution of Stokes equations. The simulated long-time diffusivity in square arrays decreases as the spacing in the array approaches the particle size in a manner consistent with a lubrication analysis. In random arrays, steric effects lead to a percolation threshold volume fraction above which long-time diffusion is arrested. The FEM/multipole approach is used to compute the long-time diffusivity far away from this threshold. An approximate analysis of mobile protein diffusion through a network of pores connected by bonds with resistances determined by the FEM/multipole calculations is then used to explore higher immobile area fractions and to evaluate the finite simulation cell size scaling behaviour of diffusion near the percolation threshold. Surprisingly, the ratio of the long-time diffusivity to the spatially averaged short-time diffusivity in these two-dimensional fixed arrays is higher in the presence of hydrodynamic interactions than in their absence. Finally, the implications of this work are discussed, including the possibility of using the methods developed here to investigate more complex diffusive phenomena observed in cell membranes.

Mesoscopic conductance fluctuations in two-dimensional percolation gold films near the percolation threshold

1996 ◽  
Vol 46 (S4) ◽  
pp. 2363-2364
Author(s):  
Boris I. Belevtsev ◽  
Evgeniy Yu. Beliayev ◽  
Evgeniy Y. Kopeichenko
Keyword(s):  
Percolation Threshold ◽  
Gold Films ◽  
Two Dimensional ◽  
Conductance Fluctuations
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