ID: 1906.07199

Notes on 8 Majorana Fermions

June 17, 2019

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David Tong, Carl Turner
High Energy Physics - Theory
Condensed Matter
Strongly Correlated Electron...

Eight Majorana fermions in $d=1+1$ dimensions enjoy a triality that permutes the representation of the $SO(8)$ global symmetry in which the fermions transform. This triality plays an important role in the quantization of the superstring, and in the analysis of interacting topological insulators and the associated phenomenon of symmetric mass generation. The purpose of these notes is to provide an introduction to the triality and its applications, with careful attention paid to various ${\bf Z}_2$ global and gauge symmetries and their coupling to background spin structures.

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