Spin models on random lattices

Wolfhard Janke, Desmond A. Johnston, Ramon Villanova

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Under certain conditions phase transitions in systems with quenched disorder are expected to exhibit a different behaviour than in the corresponding pure system. Here we discuss a series of Monte Carlo studies of a special type of such disordered systems, namely spin models defined on quenched, random lattices exhibiting geometrical disorder in the connectivity of the lattice sites. In two dimensions we present results for the q-state Potts model on random tri-valent (F3) planar graphs, which appear quite naturally in the dynamically triangulated random surface (DTRS) approach to quantum gravity, as well as on Poissonian random lattices of Voronoi/Delaunay type. Both cases, q = 4 and > 4, are discussed which, in the pure model without disorder, give rise to second- and first-order phase transitions, respectively. In three dimensions results for the Ising model on Poissonian random lattices are briefly described. We conclude with a comparison of the two types of connectivity disorder with the more standard case of bond disorder, and a discussion of the distinguishing differences.

Original languageEnglish
Pages (from-to)207-220
Number of pages14
JournalPhysica A: Statistical Mechanics and its Applications
Volume281
Issue number1
DOIs
Publication statusPublished - 15 Jun 2000
Event5th Taiwan International Symposium on Statistical Physics - Taipei, Taiwan, Province of China
Duration: 9 Aug 199912 Aug 1999

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