Directed paths with random phases |
| |
Authors: | Thomas Blum Yadin Y Goldschmidt |
| |
Institution: | Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA |
| |
Abstract: | Directed Feynman paths in 1 + 1 dimensions that acquire random phases are examined numerically and analytically. This problem is relevant for the behavior of the conductance in two-dimensional amorphous insulators in the variable-range-hopping regime. Large-scale numerical simulations were performed on a model with short-range correlations. For the scaling of the transverse fluctuations ( tν), we obtain ν = 0.68 ± 0.025; and for the r.m.s free-energy fluctuations ( tω), we obtain ω = 0.335 ± 0.01. Up to 100 000 random samples were used for times as large as 2000. These results seem to exclude a recent conjecture that ν = 3/4 and ω = 1/2. Two versions of a model with long-range correlations are solved and shown to yield ν = 1/2; a physical explanation is given. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|