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DY: Dynamik und Statistische Physik

DY 23: Symposium Renormalization and Scaling (SYRS) – Contributed Talks I

DY 23.3: Vortrag

Samstag, 5. März 2005, 14:30–14:45, TU H3010

Phase structure of anomalous Coulomb gases — •Flavio Nogueira — Institut für Theoretische Physik, Freie Universität Berlin

An anomalous Coulomb gas differs from the usual one in the sense that anomalous scaling behavior makes it to deviate from the Coulomb potential form. This special type of Coulomb gas arises in the study of Mott insulators, superconductors, quantum Hall systems, and lattice gauge theories[see for example, H. Kleinert, F. S. Nogueira, and A. Sudbø, Phys. Rev. Lett. 88, 232001 (2002); Nucl. Phys. B 666, 361 (2003)]. One example is a logarithmic Coulomb gas in three dimensions, which undergoes a phase transition similar to the Kosterlitz-Thouless phase transition. Unlike the two-dimensional case, here the fugacity of the gas acquires an anomalous dimension. The general theoretical discussion will be illustrated by recent Monte Carlo simulations [S. Kragset, A. Sudbø, and F. S. Nogueira, Phys. Rev. Lett. 92, 186403 (2004)].