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Symmetric Mode Ansatz: Theory of Magnon Collective Modes in Chern Insulators
Miguel Gonçalves, Jonah Herzog-Arbeitman, Juan Felipe Mendez-Valderrama +3
Moiré materials host integer and fractional Chern insulators (FCIs) where time-reversal is broken spontaneously by flat band ferromagnetism. In twisted MoTe2, unlike in quantum Hal…
Large scale theoretical investigation of the phase diagram of twisted bilayer MoTe at fractional fillings: agreements and contradictions with current experiments
Heqiu Li, Jiabin Yu, Xiaodong Xu +2
We present a comprehensive exact-diagonalization study of interaction-driven phases in twisted bilayer MoTe across experimentally relevant twist angles (--…
Distinguishing Mott and strain-induced anisotropic semimetals in magic-angle twisted bilayer graphene using Landau level spectroscopy
Keshav Singh, Juan Felipe Mendez-Valderrama, Erez Berg +2
Recent quantum twisting microscopy experiments [1] have provided unprecedented momentum- and energy-resolved imaging of magic-angle twisted bilayer graphene, revealing a stark dich…
The "Moiré Capacitor Effect" and Stabilization of Fractional Chern Insulators in Rhombohedral Graphene Superlattices
Nicolas Regnault, Heqiu Li, Yves H. Kwan +2
While the necessity of a moiré potential for fractional Chern insulators (FCIs) in rhombohedral graphene-hBN superlattices, first predicted in Ref. 1, is now grounded in experiment…
Mixed-dimensional quantum Monte Carlo studies of M-point moiré materials
Dumitru Călugăru, Konstantinos Vasiliou, Haoyu Hu +3
A new moiré-material platform has recently been proposed based on twisting two-dimensional triangular-lattice monolayers whose low-energy states lie at the three M points of the Br…
Twisted Bilayer Graphene Lifetimes At Integer Fillings: An Analytic Result
Haoyu Hu, Yuelin Shao, Lorenzo Crippa +5
Twisted bilayer graphene near integer fillings hosts correlated single-particle excitations whose dispersion and linewidth are increasingly accessible experimentally. We study thes…
Transport and Temperature: Exact spectrum and Drude weight for the one-dimensional infinite- Hubbard model
Shuo Liu, Yuhao Ma, Hitesh J. Changlani +2
Understanding charge transport in strongly correlated systems remains a central challenge in condensed matter physics, while exact analytical results for finite-temperature transpo…
Topological Protection by Local Support Symmetry and Destructive Interference
Jun-Won Rhim, Jaeuk Seo, Seongjun Mo +3
Conventionally, symmetry-protected topological phases and band crossings are protected by global symmetries acting on the entire system. Here, we show that symmetries preserved onl…
Obtaining the Spectral Function of Moiré Graphene Heavy-Fermions Using Iterative Perturbation Theory
Dumitru Călugăru, Haoyu Hu, Lorenzo Crippa +6
The spectral functions of twisted bilayer graphene (TBG) in the absence of strain have recently been investigated in both the symmetric and symmetry-broken phases using dynamical m…
Interplay between many-body correlations, strain and lattice relaxation in twisted bilayer graphene
Lorenzo Crippa, Gautam Rai, Dumitru Călugăru +6
In twisted bilayer graphene, a unified understanding of the mechanisms governing temperature-dependent electronic spectra and thermodynamic properties remains controversial despite…
Ferromagnetism vs. Antiferromagnetism in Narrow-Band Systems: Competition Between Quantum Geometry and Band Dispersion
Haoyu Hu, Oskar Vafek, Kristjan Haule +1
Magnetism in narrow-band systems arises from the interplay between electronic correlations, quantum geometry, and band dispersion. In particular, both ferro and anti-ferro magnets…
Emergent Interacting Phases in the Strong Coupling Limit of Twisted M-Valley Moiré Systems: Application to SnSe
Ming-Rui Li, Dumitru Calugaru, Yi Jiang +10
We construct an interacting Wannier model for both AA-stacked and AB-stacked twisted SnSe2, revealing a rich landscape of correlated quantum phases. For the AA-stacked case, the sy…
Spinless and spinful charge excitations in moiré Fractional Chern Insulators
Miguel Gonçalves, Juan Felipe Mendez-Valderrama, Jonah Herzog-Arbeitman +5
Fractionally charged elementary excitations, the quasi-electron and quasi-hole, are one of the hallmarks of the fractional Chern insulator (FCI). In this work, we observe that spon…
Dilute Paramagnetism and Non-Trivial Topology in Quasicrystal Approximant FeAl
Keenan E. Avers, Jarryd A. Horn, Ram Kumar +5
A very fundamental property of both weakly and strongly interacting materials is the nature of its magnetic response. In this work we detail the growth of crystals of the quasicrys…
Multi-Band Exact Diagonalization and an Iteration Approach to Hunt For Fractional Chern Insulators in Rhombohedral Multilayer Graphene
Heqiu Li, B. Andrei Bernevig, Nicolas Regnault
We perform a multi-band exact diagonalization (ED) study of rhombohedral pentalayer graphene twisted on hexagonal boron nitride with a focus on fractional Chern insulators (FCI) in…
"Berry Trashcan" Model of Interacting Electrons in Rhombohedral Graphene
B. Andrei Bernevig, Yves H. Kwan
We present a model for interacting electrons in a continuum band structure that resembles a ``trashcan'', with a flat bottom of radius beyond which the dispersion increases r…
Kekulé Spiral Order from Strained Topological Heavy Fermions
Jonah Herzog-Arbeitman, Dumitru Călugăru, Haoyu Hu +5
The topological heavy fermion (THF) model of twisted bilayer graphene is a framework for treating its strongly interacting topological flat bands. In this work, we employ the THF m…
Projected and Solvable Topological Heavy Fermion Model of Twisted Bilayer Graphene
Haoyu Hu, Zhi-Da Song, B. Andrei Bernevig
We investigate the topological heavy-fermion (THF) model of magic-angle twisted bilayer graphene (MATBG) in the projected limit, where only the flat bands are present in the low-en…
A New Moiré Platform Based on M-Point Twisting
Dumitru Călugăru, Yi Jiang, Haoyu Hu +9
We introduce a new class of moiré systems and materials based on monolayers with triangular lattices and low-energy states at the M points of the Brillouin zone. These M-point moir…
Discovery of an Antiferromagnetic Topological Nodal-line Kondo Semimetal
D. F. Liu, Y. F. Xu, H. Y. Hu +34
The symbiosis of strong interactions, flat bands, topology and symmetry has led to the discovery of exotic phases of matter, including fractional Chern insulators, correlated moiré…
Competing phases in kagome magnet FeGe from functional renormalization
Pietro M. Bonetti, Yi Jiang, Haoyu Hu +4
The discovery of a charge density wave in FeGe extends the discussion of the nature of charge order in kagome metals to a magnetic compound. Motivated by this observation, we combi…
CeCoP: a unique Co-antiferromagnetic topological heavy-fermion system with -protected Kondo effect and nodal-line excitations
Haoyu Hu, Yi Jiang, Defa Liu +5
Based on high-throughput screening and experimental data, we find that CeCoP is unique in heavy-fermion materials: it has a Kondo effect at a high temperature which is none…
Cascade of pressure induced competing CDWs in the kagome metal FeGe
A. Korshunov, A. Kar, C. -Y. Lim +14
Electronic ordering is prevalent in correlated systems, which commonly exhibit competing interactions. Here, we use x-ray diffraction to demonstrate a cascade of pressure induced o…
Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
D. Subires, A. Kar, A. Korshunov +18
The intrinsic frustrated nature of a kagome lattice is amenable to the realization of exotic phases of matter, such as quantum spin liquids or spin ices, and more recently the mult…