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Imaging real-space flat band localization in kagome magnet FeSn
Daniel Multer, Jia-Xin Yin, Md. Shafayat Hossain +12
Kagome lattices host flat bands due to their frustrated lattice geometry, which leads to destructive quantum interference of electron wave functions. Here, we report imaging of the…
Topological kagome magnets and superconductors
Jia-Xin Yin, Biao Lian, M Zahid Hasan
A kagome lattice naturally features Dirac fermions, flat bands and van Hove singularities in its electronic structure. The Dirac fermions encode topology, flat bands favour correla…
Entanglement Entropy of Free Fermions in Timelike Slices
Bowei Liu, Hao Chen, Biao Lian
We define the entanglement entropy of free fermion quantum states in an arbitrary spacetime slice of a discrete set of points, and particularly investigate timelike (causal) slices…
A Quantum Breakdown Model: from Many-body Localization to Chaos with Scars
Biao Lian
We propose a quantum model of fermions simulating the electrical breakdown process of dielectrics. The model consists of sites with fermion modes per site, and has a conser…
Magnetization-direction-tunable kagome Weyl line
Zi-Jia Cheng, Ilya Belopolski, Tyler A. Cochran +21
Kagome magnets provide a fascinating platform for a plethora of topological quantum phenomena. Here, utilizing angle-resolved photoemission spectroscopy, we demonstrate Weyl lines…
Magic angles in twisted bilayer graphene near commensuration: Towards a hypermagic regime
Michael G. Scheer, Kaiyuan Gu, Biao Lian
The Bistritzer-MacDonald continuum model (BM model) describes the low-energy moiré bands for twisted bilayer graphene (TBG) at small twist angles. We derive a generalized continuum…