Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Topological Semimetals
TT 25.13: Vortrag
Donnerstag, 8. September 2022, 13:00–13:15, H3
Weyl-point teleportation — •György Frank1,2, Dániel Varjas3, Gergö Pintér1,2, and András Pályi1,2 — 1Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary — 2MTA-BME Exotic Quantum Phases Group, Budapest University of Technology and Economics, Hungary — 3Department of Physics, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden
In this work, we describe the phenomenon of Weyl-point teleportation. Weyl points usually move continuously in the configuration parameter space of a quantum system when the control parameters are varied continuously. However, there are special transition points in the control space where the continuous motion of the Weyl points is disrupted. In such transition points, an extended nodal structure (nodal line or nodal surface) emerges, serving as a wormhole for the Weyl points, allowing their teleportation in the configuration space. A characteristic side effect of the teleportation is that the motional susceptibility of the Weyl point diverges in the vicinity of the transition point, and this divergence is characterized by a universal scaling law. We exemplify these effects via a two-spin model and a Weyl Josephson circuit model. We expect that these effects generalize to many other settings including electronic band structures of topological semimetals.