47 citations · 143 across the 34 of their papers we have counts for
35 papers
Pairing from repulsive interactions in twisted WSe2 from functional renormalization
Hannes Braun, Dumitru Călugăru, Pietro M. Bonetti +9
Motivated by the observation of superconductivity in twisted bilayer WSe over an extended range of displacement fields, reaching from the correlated insulator down to zero fiel…
Resonant Far-Infrared Spectroscopy of Flat-Band Fermions in Magic Angle Graphene
Ayelet J. Uzan-Narovlansky, Ipsita Das, Juan F. Mendez Valderrama +10
Moiré engineering in twisted two-dimensional (2D) materials radically alters low-energy bands, interactions and topological quantum states. Despite extensive studies, optical spect…
Thermodynamic phase transition, pairing symmetry and Fermi surface topology in Ruddlesden-Popper nickelate films
Yu Miao, Zhiwei Wang, Hongxu Sun +9
Ruddlesden-Popper (RP) nickelates provide an uncharted territory to explore high-transition-temperature (high-) superconductivity and superconducting mechanism. Here, we inves…
Extended s-wave superconductivity in M-point twisted bilayer SnSe2
Lennart Klebl, Ammon Fischer, Salahudin V. Smailagić +6
We investigate the emergence of electronic order and unconventional superconductivity in M-valley moiré materials. Starting from a first-principles Wannier model of AB-stacked twis…
Momentum Structure of Superconductivity and Sublattice Effects from Quasiparticle Interference in CsVSb
Aaron G. Greenberg, Xinze Yang, Junze Deng +11
Quantum interference encoded in the sublattice texture of kagome Bloch wavefunctions has been widely invoked as a route to correlated states, including chiral charge order, unconve…
Quantum geometry and critical temperature enhancement in MgB superconductivity
Yi Jiang, Haoyu Hu, Dumitru Călugăru +13
MgB, a phonon-mediated superconductor with record-high critical temperature K, is revisited to obtain a comprehensive theory of electrons, phonons, and their cou…
Quantum-Geometry-Induced Superconductivity near a Fractional Chern Insulator
Haoyu Hu, Lei Chen
Recent moiré experiments and numerical studies of interacting Chern bands have revealed fractional Chern insulators, charge-density-wave order, and superconductivity as proximate c…
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…
Engineering topological flat bands in -valley moiré systems with Ising-type SOC: twisted 1T-ZrS and 1T-SnSe
Hanqi Pi, Yves H. Kwan, Haoyu Hu +8
Twisted moiré superlattices hosting topological flat bands provide a platform to explore the interplay between topology and correlations. Here we investigate topological band struc…
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…
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…
Quantum Geometry in the NbSe Family I: Obstructed Compact Wannier Function and New Perturbation Theory
Jiabin Yu, Yi Jiang, Yuanfeng Xu +8
We revisit the electronic structure and band topology of monolayer 1H-NbSe, which hosts both superconductivity and charge density wave, and its related compounds 1H-MoS, Nb…
Ideal Topological Flat Bands in Two-dimensional Moiré Heterostructures with Type-II Band Alignment
Yunzhe Liu, Anoj Aryal, Kaijie Yang +6
Topological flat bands play an essential role in inducing exotic interacting physics, ranging from fractional Chern insulators to superconductivity, in moiré materials. In this wor…
Resolving Intervalley Gaps and Many-Body Resonances in Moiré Superconductor
Hyunjin Kim, Gautam Rai, Lorenzo Crippa +15
Magic-angle twisted multilayer graphene stands out as a highly tunable class of moiré materials that exhibit strong electronic correlations and robust superconductivity. However, u…
Theory of Superconductivity in LaRuSi and Predictions of New Kagome Flat Band Superconductors
Junze Deng, Yi Jiang, Tiago F. T. Cerqueira +14
We present a comprehensive investigation of the flat-band kagome superconductor LaRuSi, which has recently been reported to host charge density wave (CDW) order above room…
Heavy fermions, mass renormalization and local moments in magic-angle twisted bilayer graphene via planar tunneling spectroscopy
Zhenyuan Zhang, Shuang Wu, Dumitru Călugăru +5
Topological heavy fermion models[1-5] describe the flat bands in magic-angle twisted bilayer graphene (MATBG) as arising from the hybridization between localized flat-band orbitals…
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…
Phonon spectra, quantum geometry, and the Goldstone theorem
Guglielmo Pellitteri, Zenan Dai, Haoyu Hu +5
Phonons are essential quasi-particles of all crystals and play a key role in fundamental properties such as thermal transport and superconductivity. In particular, acoustic phonons…
Probing the Quantized Berry Phases in 1H-NbSe Using Scanning Tunneling Microscopy
Dumitru Călugăru, Yi Jiang, Haojie Guo +7
Topologically trivial insulators are classified into two primary categories: unobstructed and obstructed atomic insulators. While both types can be described by exponentially local…
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…