792 citations · 6.7k across the 69 of their papers we have counts for
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Toward bootstrapping tensor-network contractions
Seishiro Ono, Yanbai Zhang, Hoi Chun Po
Accurate contraction of tensor networks beyond one dimension is essential in various fields including quantum many-body physics. Existing approaches typically rely on approximate c…
Interplay of ferromagnetism, nematicity and Fermi surface nesting in kagome flat band
Yuman He, Wentao Jiang, Siqi Wu +4
Recent experiment on Fe-doped CoSn has uncovered a series of correlated phases upon hole doping of the kagome flat bands. Among the phases observed, a nematic phase with a six- to…
Quasi-local Frustration-Free Free Fermions
Shunsuke Sengoku, Hoi Chun Po, Haruki Watanabe
Recent studies have revealed that frustration-free models, expressed as sums of finite-range interactions or hoppings, exhibit several properties markedly different from those of f…
Local spectroscopy of loop current order with individual magnetic atoms
Jiangchang Zheng, Caiyun Chen, Xu Zhang +16
Hidden ordered states--characterized by order parameters that elude conventional probes--pose a fundamental challenge for their identification in quantum materials. Recent experime…
Frustration-free free fermions
Seishiro Ono, Rintaro Masaoka, Haruki Watanabe +1
We develop a general theory of frustration-free free-fermion systems and derive the necessary and sufficient conditions for such Hamiltonians. Assuming locality and translation inv…
Frustration-free free fermions and beyond
Rintaro Masaoka, Seishiro Ono, Hoi Chun Po +1
Frustration-free Hamiltonians provide pivotal models for understanding quantum many-body systems. In this paper, we establish a general framework for frustration-free fermionic sys…
Anomalous Landau levels and quantum oscillation in rotation-invariant insulators
Jianlong Fu, Chun Yu Weng, Hoi Chun Po
Landau levels in certain models are known to protrude into the zero-field energy gap. These are known as anomalous Landau levels (ALLs). We study whether ALLs can lead to Fermi-sur…
Cascade of strongly correlated quantum states in a partially filled kagome flat band
Caiyun Chen, Jiangchang Zheng, Yuman He +7
Coulomb interactions among charge carriers that occupy an electronic flat band have a profound impact on the macroscopic properties of materials. At sufficient strength, these inte…
Constructive Fermionic Matrix Product States for Projected Fermi Sea
Kangle Li, Yan-Bai Zhang, Hoi Chun Po
Projected wave functions offer a means for incorporating local correlation effects in gapless electronic phases of matter like metals. Although such wave functions can be readily s…
Coexistence of interacting charge density waves in a layered semiconductor
B. Q. Lv, Alfred Zong, Dong Wu +14
Coexisting orders are key features of strongly correlated materials and underlie many intriguing phenomena from unconventional superconductivity to topological orders. Here, we rep…
Stacked tree construction for free-fermion projected entangled pair states
Yuman He, Kangle Li, Yanbai Zhang +1
The tensor network representation of a state in higher dimensions, say a projected entangled-pair state (PEPS), is typically obtained indirectly through variational optimization or…
Symmetric Jordan-Wigner transformation in higher dimensions
Hoi Chun Po
The Jordan-Wigner transformation is traditionally applied to one dimensional systems, but recent works have generalized the transformation to fermionic lattice systems in higher di…
Higher-dimensional Jordan-Wigner Transformation and Auxiliary Majorana Fermions
Kangle Li, Hoi Chun Po
We discuss a scheme for performing Jordan-Wigner transformation for various lattice fermion systems in two and three dimensions which keeps internal and spatial symmetries manifest…
Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator
Carina A. Belvin, Edoardo Baldini, Ilkem Ozge Ozel +11
Collective excitations of bound electron-hole pairs -- known as excitons -- are ubiquitous in condensed matter, emerging in systems as diverse as band semiconductors, molecular cry…
Fractional corner magnetization of collinear antiferromagnets
Haruki Watanabe, Yasuyuki Kato, Hoi Chun Po +1
Recent studies revealed that the electric multipole moments of insulators result in fractional electric charges localized to the hinges and corners of the sample. We here explore t…
Topological flat bands in frustrated kagome lattice CoSn
Mingu Kang, Shiang Fang, Linda Ye +8
Electronic flat bands in momentum space, arising from strong localization of electrons in real space, are an ideal stage to realize strong correlation phenomena. In certain lattice…
Derivation of Wannier orbitals and minimal-basis tight-binding hamiltonians for twisted bilayer graphene: a first-principles approach
Stephen Carr, Shiang Fang, Hoi Chun Po +2
Twisted bilayer graphene (TBLG) has emerged as an important platform for studying correlated phenomena, including unconventional superconductivity, in two-dimensional systems. The…
Landau Level Degeneracy in Twisted Bilayer Graphene: Role of Symmetry Breaking
Ya-Hui Zhang, Hoi Chun Po, T. Senthil
The degeneracy of Landau levels flanking charge neutrality in twisted bilayer graphene is known to change from eight-fold to four-fold when the twist angle is reduced to values nea…
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…
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…
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…
Symmetry indicators and anomalous surface states of topological crystalline insulators
Eslam Khalaf, Hoi Chun Po, Ashvin Vishwanath +1
The rich variety of crystalline symmetries in solids leads to a plethora of topological crystalline insulators (TCIs) featuring distinct physical properties, which are conventional…
Structure and Topology of Band Structures in the 1651 Magnetic Space Groups
Haruki Watanabe, Hoi Chun Po, Ashvin Vishwanath
The properties of electrons in magnetically ordered crystals are of interest both from the viewpoint of realizing novel topological phases, such as magnetic Weyl semimetals, and fr…