Fermi Surface Anomaly and Symmetric Mass Generation


You, Y. (2023). Fermi Surface Anomaly and Symmetric Mass Generation. Perimeter Institute. https://pirsa.org/23050024


You, Yi-Zhuang. Fermi Surface Anomaly and Symmetric Mass Generation. Perimeter Institute, May. 18, 2023, https://pirsa.org/23050024


          @misc{ pirsa_PIRSA:23050024,
            doi = {10.48660/23050024},
            url = {https://pirsa.org/23050024},
            author = {You, Yi-Zhuang},
            keywords = {Condensed Matter},
            language = {en},
            title = {Fermi Surface Anomaly and Symmetric Mass Generation},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {may},
            note = {PIRSA:23050024 see, \url{https://pirsa.org}}

Yi-Zhuang You University of California, San Diego

Talk Type Scientific Series


Fermi liquids are gapless quantum many-body states of fermions, which describes electrons in the normal state of most metals at low temperature. Despite its long history of study, there has been renewed interest in understanding the stability of Fermi liquid from the perspectives of emergent symmetry and quantum anomaly. In this talk, I will introduce the concept of Fermi surface anomaly and propose a possible scheme to classify it. The classification scheme is based on viewing the Fermi surface as the boundary of a Chern insulator in the phase space, with an unusual dimension counting arising from the non-commutative phase space geometry. This enables us to extend the notion of Fermi surface anomaly to the non-perturbative cases and discuss symmetric mass generation on the Fermi surface when the anomaly is canceled. I will provide examples of lattice models that demonstrate Fermi surface symmetric mass generation and make connections to the recent progress in understanding the pseudo-gap transition in cuprate materials.

Zoom link: https://pitp.zoom.us/j/97223165997?pwd=SkhJZEt1ejhQRm0yK2tKS3NhM2o2Zz09