Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 56: Correlated Electrons: Quantum-Critical Phenomena – Theory

TT 56.4: Vortrag

Mittwoch, 18. März 2015, 10:15–10:30, A 053

Disorder-driven Coulomb gas transitions in classical three-dimensional dimer models — •Stefan Wolff^1,2 and Simon Trebst² — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — ²Institut für Theoretische Physik, Universität zu Köln, Germany

Frustrated magnets can harbor emergent Coulomb phases at low temperatures that exhibit a characteristic power-law decay of correlations and an extensive ground-state manifold. Here we discuss this physics in the context of classical dimer models -- prototypical systems that allow to directly study such Coulomb phases. Our focus is on the effect of disorder, which we model by successive percolation of the bonds in a family of three-dimensional lattices with varying coordination number. Notably, our large-scale numerical simulations clearly demonstrate that the break-down of the Coulomb phase is well separated from the percolation transition. We discuss the order of the various phase transitions and the nature of the intermediate phase.