Fundamental Bound on Topological Gap
Yugo Onishi, Liang Fu
Abstract
We provide a universal tight bound on the energy gap of topological insulators by exploring relationships between topology, quantum geometry, and optical absorption. Applications of our theory to infrared absorption near topological band inversion, magnetic circular dichroism in Chern insulators, and topological gap in moiré materials are demonstrated. Published by the American Physical Society 2024
Topics & Concepts
Topology (electrical circuits)PhysicsComputer scienceTheoretical physicsMathematicsCombinatoricsTopological Materials and PhenomenaAlgebraic structures and combinatorial modelsQuantum many-body systems