792 citations · 6.7k across the 69 of their papers we have counts for
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Fragile topological phases in interacting systems
Dominic V. Else, Hoi Chun Po, Haruki Watanabe
Topological phases of matter are defined by their nontrivial patterns of ground-state quantum entanglement, which is irremovable so long as the excitation gap and the protecting sy…
Faithful Tight-binding Models and Fragile Topology of Magic-angle Bilayer Graphene
Hoi Chun Po, Liujun Zou, T. Senthil +1
Correlated insulators and superconductivity have been observed in "magic-angle" twisted bilayer graphene, when the nearly flat bands close to neutrality are partially filled. While…
Towards ideal topological materials: Comprehensive database searches using symmetry indicators
Feng Tang, Hoi Chun Po, Ashvin Vishwanath +1
Topological materials (TMs) showcase intriguing physical properties defying expectations based on conventional materials, and hold promise for the development of devices with new f…
Topological Materials Discovery By Large-order symmetry indicators
Feng Tang, Hoi Chun Po, Ashvin Vishwanath +1
Crystalline symmetries play an important role in the classification of band structures, and the rich variety of spatial symmetries in solids leads to various topological crystallin…
Band Structure of Twisted Bilayer Graphene: Emergent Symmetries, Commensurate Approximants and Wannier Obstructions
Liujun Zou, Hoi Chun Po, Ashvin Vishwanath +1
A remarkable feature of the band structure of bilayer graphene at small twist angle is the appearance of isolated bands near neutrality, whose bandwidth can be reduced at certain m…
Efficient Topological Materials Discovery Using Symmetry Indicators
Feng Tang, Hoi Chun Po, Ashvin Vishwanath +1
Although the richness of spatial symmetries has led to a rapidly expanding inventory of possible topological crystalline (TC) phases of electrons, physical realizations have been s…
Origin of Mott insulating behavior and superconductivity in twisted bilayer graphene
Hoi Chun Po, Liujun Zou, Ashvin Vishwanath +1
A remarkable recent experiment has observed Mott insulator and proximate superconductor phases in twisted bilayer graphene when electrons partly fill a nearly flat mini-band that a…