Quantum phase transitions of the diluted O(3) rotor model

Thomas Vojta, Rastko Sknepnek

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We study the phase diagram and the quantum phase transitions of a site-diluted two-dimensional O(3) quantum rotor model by means of large-scale Monte Carlo simulations. This system has two quantum phase transitions: a generic one for small dilutions and a percolation transition across the lattice percolation threshold. We determine the critical behavior for both transitions and for the multicritical point that separates them. In contrast to the exotic scaling scenarios found in other random quantum systems, all these transitions are characterized by finite-disorder fixed points with power-law scaling. We relate our findings to a recent classification of phase transitions with quenched disorder according to the rare region dimensionality, and we discuss experiments in disordered quantum magnets.

Original languageEnglish
Article number094415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number9
DOIs
Publication statusPublished - 13 Sep 2006

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