Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Quantum-Critical Phenomena

TT 2.7: Vortrag

Montag, 26. März 2007, 11:15–11:30, H19

Interplay between chiral symmetry breaking and spinon confinement in Mott insulators — •Flavio Nogueira and Hagen Kleinert — Institut für Theoretische Physik, Freie Universität Berlin

It is well known that compact quantum electrodynamics in 2+1 dimensions (QED₃) is an effective theory Mott insulators near the so called resonating valence-bond (RVB) flux phase. We have recently demonstrated the stability of the spin liquid for a large enough number of spinon species [1]. However, the effect of chiral symmetry breaking (CSB), which leads to the appearence of spin density wave, was not considered. CSB is known to occur in noncompact QED₃. In this work we discuss the interplay between CSB and confinement in the compact case and point out the consequences for the stability of spin liquids for the physically relevant number of spinon species, N=2.

[1] F. S. Nogueira and H. Kleinert, Phys. Rev. Lett. 95, 176406 (2005)