8 papers
Emergent heavy fermion and superconductivity near Mott transition in twisted bilayer graphene
Ya-Hui Zhang
Near a bandwidth-tuned Mott transition, the Fermi velocity and quasiparticle residue of a metal often vanish. Here, we show that analogous phenomena emerge in twisted bil…
Quantum Mott semimetal in a one-dimensional Hubbard model
Boran Zhou, Taige Wang, Ya-Hui Zhang
Mott physics in topological bands has recently attracted considerable attention, particularly in the context of twisted bilayer graphene (TBG). However, the essential ingredients f…
Displacement-Field-Driven Semimetal-Superconductor Transition in Magic-Angle Twisted Trilayer Graphene
Bokai Liang, Jing-Yu Zhao, Ya-Hui Zhang
Magic-angle twisted trilayer graphene(MATTG) hosts versatile displacement-field-tuned correlated phenomena. MATTG consists of a dispersive Dirac cone which hybridizes with the flat…
Symmetric topological Mott insulator and Mott semimetal
Boran Zhou, Ya-Hui Zhang
Correlated physics in nearly flat topological bands is a central theme in the study of moiré materials. While ground states at integer fillings are typically identified as quantum…
Resonating-valence-bond superconductor from small Fermi surface in twisted bilayer graphene
Jing-Yu Zhao, Ya-Hui Zhang
Mechanism of superconductivity in twisted bilayer graphene (TBG) remains one of the central problems in correlated moiré materials. The most intriguing question is about the natur…
Mixed valence Mott insulator and composite excitation in twisted bilayer graphene
Jing-Yu Zhao, Boran Zhou, Ya-Hui Zhang
Interplay of strong correlation and flat topological band has been a central problem in moiré systems such as the magic angle twisted bilayer graphene (TBG). Recent studies show t…