Quantum oscillations probe the Fermi surface topology of the nodal-line semimetal CaAgAs
Y. H. Kwan, P. Reiss, Y. Han, M. Bristow, D. Prabhakaran, D. Graf, A. McCollam, S. A. Parameswaran, A. I. Coldea
Abstract
CaAgAs has been proposed as an ideal topological nodal-line semimetal, whose Fermi surface at small hole-doping forms a torus. Here the authors use quantum oscillations to establish the shape and topology of this unique Fermi surface. Furthermore, by analyzing the Berry phases of the semiclassical electronic orbits, the paper demonstrates the topological nature of the underlying nodal ring.
Topics & Concepts
Semiclassical physicsTopology (electrical circuits)PhysicsQuantum oscillationsFermi Gamma-ray Space TelescopeGeometric phaseQuantumFermi surfaceSurface (topology)Quantum mechanicsSemimetalIdeal (ethics)Condensed matter physicsOscillation (cell signaling)Berry connection and curvatureFermi levelFermi energyTopological quantum numberTheoretical physicsTopological Materials and PhenomenaSurface and Thin Film PhenomenaQuantum and electron transport phenomena