AIMR Math Group Seminar #9

FY2018

 

Date : Jul 13th (Fri.) 10:00~12:00

Place:3C, AIMR Main Bldg., Katahira campus, Tohoku University


SpeakerDr. Guo Chuan Thiang

Title : Geometry, super-indices and crystallographic bulk-edge correspondence

 

Abstract

The Gohberg-Krein index theorem is manifested physically as a bulk-edge correspondence for supersymmetric spectrally-gapped Hamiltonians on a 1D chain: a “bulk winding number” equals the number of “edge zero modes”. I will explain how new, possibly mod k, index theorems may be derived by extending the physical heuristic to the crystallographic setting. Three general insights are discussed: geometry plays an important role, edges generally have more interesting symmetry than just a basic space group, and “crystallographic T-duality” exists for any space group.

 

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 Advanced Institute for Materials Research Tohoku University Mathematical Group
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