Spin texture as a bulk indicator of fragile topology

• DOI: 10.1103/physrevresearch.5.033013
• Publication Date: 2023-07-07T14:23:33Z
• Authors: Gunnar F. Lange; Adrien Bouhon; Robert-Jan Slager
• Keywords: Rare Diseases; Fragile X Syndrome; Intellectual and Developmental Disabilities (IDD); Physics; QC1-999; 0103 physical sciences; 01 natural sciences; 51 Physical Sciences; Brain Disorders

We study the relationship between momentum-space spin textures \textcolor{red}{projected onto the occupied bands} and Wilson loop winding, proving a map between band topology of and spin topology in certain restricted symmetry settings relevant to fragile topology. Our results suggest that, in specific scenarios, the spin gap may act as a smoking gun bulk indicator for fragile topology.