Emergent phenomena in complex electron systems

Datum

17.06.2014

Zeit

16:40 - 18:10

Sprecher

Dr. Jochen Geck

Zugehörigkeit

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden

Serie

TUD Physikalisches Kolloquium

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

Prof. Dr. Carsten Timm, Fachrichtung Physik

Beschreibung

Complex systems are a pervasive feature of nature and challenge scientists across the disciplines. In solid state physics, correlated electron materials with strong electron-electron and electron-lattice interactions realize a multitude of complex systems. As such, these materials exhibit emergent properties, i.e., they show phenomena which cannot be easily traced back to the microscopic interactions between the constituents. Famous examples for this are unconventional superconductivity or the various kinds of self-organized spatial electronic order. In this talk, I will briefly introduce complex systems and then show examples from solid state physics, which are concerned with electronic superlattices in correlated electron systems. The detection of these superlattices by means of resonant elastic x-ray scattering will be described first and discussed for the specific example of the doped cuprates. Then it will be illustrated how dramatic electronic order in real space can affect the electronic structure in momentum space as seen by angle-resolved photoemission. These couplings are in many cases not well understood, as will be elucidated for URu2Si2 and 1T-TaS2. Finally, it will be described that electronic superlattices can also set the stage for topologically non-trivial defect structures on a larger, mesoscopic length scale. Self-organization in complex electron systems thus spans various length and energy scales, providing a fascinating playground for basic and applied condensed matter research alike.

Links

• http://tu-dresden.de/veranstaltungen/termin?id=TUD5363a90c9be0a

Letztmalig verändert: 17.06.2014, 09:45:06