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TT: Fachverband Tiefe Temperaturen

TT 51: Topological Semimetals II

TT 51.3: Talk

Wednesday, March 20, 2024, 15:30–15:45, H 3007

Fermi-Arc Metals — •Maxim Breitkreiz, Tommy Li, and Piet Brouwer — Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany

Weyl-semimetal superstructures with spatially varying positions of Weyl nodes host a chiral-symmetry preserving Fermi-arc metal state, where the chirality is carried by three-dimensional flat bands instead of Weyl nodes, which can be understood as being built from Fermi arc-like states. In this talk I introduce this novel topological state and discuss some of its characteristic transport and interaction effects. In particular, I will show that a helical node-position variation supports an excitonic instability leading to a dynamical axion insulator.

Keywords: Fermi arcs; axions; flat bands; Weyl semimetals; topological metals