Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Topological Semimetals

TT 25.1: Invited Talk

Thursday, September 8, 2022, 09:30–10:00, H3

Topology: Open and with diverse backgrounds — •Tobias Meng — Institute of Theoretical Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01069 Dresden, Germany

The advent of topological physics has been a major disruption in the way we think about condensed matter physics. In its most basic form, topological physics relies on the definition of topological invariants defined from the wave functions in the Brillouin zone, including for example the Chern number governing the Hall effect. Implicitly, this view of topological physics requires closed systems with translation invariance.

In this talk, I will show that the fact that any experimental system is open (coupled to its environment) and never fully translationally invariant can be a resource rather than a nuisance. When suitable couplings to environments and inhomogeneities are induced, topological systems exhibit a plethora of novel phenomena, including black hole analogies and new Hall responses. This highlights that the study of topological systems out of their "comfort zone" (closed and translational invariant) is a worthwhile direction for future research.