I am currently studying topological insulators and occasionally the concept of non-Abelian phases and non-Abelian gauge transformations comes up in related literature. However, my understanding of these concepts are hazy and inadequate. From what I understand they are related to gauge theory.
Can anyone recommend any introductory resources that I can read to begin to understand these topics, specifically in the context of TI? I would also appreciate it if you could outline how these concepts and any others that are pertinent, relate to TI and other subjects such as QFT.
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