Regensburg 2022 – wissenschaftliches Programm

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SYQM: Complexity and Topology in Quantum Matter

SYQM 1: Complexity and Topology in Quantum Matter

SYQM 1.3: Hauptvortrag

Freitag, 9. September 2022, 10:30–11:00, H1

Spectral Sensitivity of Non-Hermitian Topological Systems — •Jan Carl Budich — Institute of Theoretical Physics, Technische Universität Dresden and Würzburg-Dresden Cluster of Excellence ct.qmat, 01062 Dresden, Germany

In a wide variety of physical scenarios ranging from classical meta-materials to correlated quantum many-body systems, non-Hermitian (NH) Hamiltonians have proven to be a powerful and conceptually simple tool for effectively describing dissipation. Motivated by recent experimental discoveries, investigating the topological properties of such NH systems has become a broad frontier of current research. In this talk, I will focus on a remarkable spectral sensitivity unique to NH topological systems. After an introductory discussion of the general theoretical background of this algebraic phenomenon, I will present several of its salient physical manifestations, including its impact on quasi-particles in correlated solids, and its potential for devising novel high-precision sensors.