Dr. Maxim Breitkreiz ist Leiter der neuen Emmy Noether-Nachwuchsgruppe "Mikroskopische und Nanoskopische Physik Topologischer Metalle" am Fachbereich Physik. In diesem Vortrag stellt er seine Forschung auf dem Gebiet der theoretischen Physik kondensierter Materie und der Elementarteilchenphysik vor. Von besonderem Interesse ist dabei die Erforschung von Quantenanomalien, die in Nanostrukturen von topologischen Metallen auftreten

Quantum-mechanical systems that break a symmetry of its classical action are called quantum anomalous. Such systems challenge our understanding of fundamental physics and enable exotic and potentially useful response properties. While first predicted in the elementary-particle quantum field theory for hypothetical massless fermions, quantum anomalies have been already realized in condensed matter, where the massless fermions arise as topologically protected quasiparticles. 

In this talk I will introduce quantum-anomalous matter and I will present some of our recently predicted anomaly-related phenomena at interfaces and in superstructures of anomaly-hosting materials. Some of these phenomena modify our basic text-book understanding of metals. In particular, I will show the effect of an invisible Fermi surface: A Fermi surface that remains invisible in standard quantum-oscillation experiments for Fermi-surface mapping, such as Shubnikov-de Haas and de Haas-van Alphen effects.