Alchemy for the 21st century: creating topological behavior in periodically-driven systems

Datum

28.04.2015

Zeit

16:40 - 18:10

Sprecher

Prof. Dr. Mark S. Rudner

Zugehörigkeit

Niels Bohr Institute Copenhagen

Serie

TUD Physikalisches Kolloquium

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

Prof. Dr. Carsten Timm, Fachrichtung Physik

Beschreibung

Recent work on topological materials has revealed a wide variety of intriguing phenomena that may arise when particles move in "non-trivial" bands. Modern advances in experimental capabilities for controlling electronic, atomic, and optical systems raise the possibility that analogous phenomena may be generated dynamically in driven systems. In this talk I will briefly review the basic ideas behind topological band theory, and then discuss the corresponding situation for periodically driven systems. While analogues of all classes in the periodic table of topological band insulators can be realized in driven systems, the topological classification in the driven case turns out to be much richer. For example, a two dimensional driven system in which all "Floquet bands" have trivial topological (Chern) indices may still host robust chiral edge modes. I will explain how this occurs, where the topological protection is hidden, and give some outlook on recent and proposed experiments on these so-called Floquet topological insulators.

Links

• http://tu-dresden.de/veranstaltungen/termin?id=TUD54fdc1713d19f

Letztmalig verändert: 28.04.2015, 09:35:49