Physics Colloquium: Raquel Queiroz, "A local view on topology"

Wed, Sep 07, 2022 - 04:00 PM — Wed, Sep 07, 2022 - 05:00 PM
Admission Fee
Event Address
Marshak Science Building, Room 418N, and by Zoom. For details, please contact Sriram Ganeshan,
Event Details

A local view on topology


Raquel Queiroz

Assistant Professor of Physics Department of Physics

Columbia University, New York, NY



In this talk, I revisit the notion of topology in solid-state materials from a local perspective. This view highlights qualitative differences in the physical response to local perturbations between topological and trivial systems, from topological semimetals to topological insulators. I will introduce the notion of ring states as a precursor of boundary states in topological materials and show how they give rise to the celebrated bulk-boundary correspondence. This perspective provides a unifying framework for topology centered on symmetry, from local symmetry to crystalline symmetry. I will make the discussion concrete by analyzing the effect of local defects from the well-known Chern insulators to more exotic new topological phases, such as fragile topological insulators protected by lattice symmetries.

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