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TT: Tiefe Temperaturen

TT 21: Symposium Frustrated Systems

TT 21.1: Fachvortrag

Montag, 7. März 2005, 14:00–14:25, TU H104

Competing Electronic Interactions and Complex Topology — •Wolfram Brenig — Institute for Theoretical Physics, Technical University of Braunschweig, Germany

The interplay between competing interactions and complex topology is an emerging common theme in many condensed matter systems. On the one hand geometrically frustrated lattice topologies may hinder a physical system to minimize all of its two-particle interactions simultaneously, leading to novel elementary excitations, very low energy scales and even to macroscopically degenerate ground states. On the other hand, competing interactions can induce complex electronic topologies, like intrinsic superstructures, inhomogeneities or micro-phase-separation. This talk will survey some of these phenomenon, with a focus on systems with magnetic and electronic degrees of freedom. Work supported in part by the DFG through SPP 1073.