Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série FORUM-ENS
Domaines cond-mat.stat-mech
Date Mercredi 11 Décembre 2024
Heure 12:45
Institut LPENS
Salle 3 rue dUlm, College de France
Nom de l'orateur Mao
Prenom de l'orateur Dan
Addresse email de l'orateur
Institution de l'orateur Zurich
Titre Tiling with Electrons: fractionalization and emergent symmetry
Résumé Geometrical frustration is a simple yet profound concept in condensed matter physics that can give rise to exotic quantum matters like spin liquid. In this talk, I will propose a new source of geometrical frustration from the orbitals instead of the spins of the electrons. A concrete platform for realizing such orbital geometrical frustration is the twisted bilayer graphene (TBG) at fractional filling, where we can map the configurations of electrons to the tiling patterns of trimers. From this mapping, we can uncover novel charge fractionalization behavior. Furthermore, we find an emergent exact global symmetry, dubbed ``tile-invariant symmetry”. Quantum fluctuation can spontaneously break the tile-invariant symmetry, giving rise to an exotic, gapless Mott insulator.
Numéro de preprint arXiv
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