219 citations · 617 across the 19 of their papers we have counts for
20 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…
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…
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…
Fragility of local moments against hybridization with flat bands
Max Fischer, Arianna Poli, Lorenzo Crippa +5
The Kondo screening of a localized magnetic moment crucially depends on the spectral properties of the electronic bath to which it is coupled. Unlike textbook examples, realistic s…
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…
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…
Cryo-Near-Field Photovoltage Microscopy of Heavy-Fermion Twisted Symmetric Trilayer Graphene
Sergi Batlle-Porro, Dumitru Calugaru, Haoyu Hu +7
Ever since the initial experimental observation of correlated insulators and superconductivity in the flat Dirac bands of magic angle twisted bilayer graphene, a search for the mic…
Evidence of heavy fermion physics in the thermoelectric transport of magic angle twisted bilayer graphene
Rafael Luque Merino, Dumitru Calugaru, Haoyu Hu +7
It has been recently postulated, that the strongly correlated flat bands of magicangle twisted bilayer graphene (MATBG) can host coexisting heavy and light carriers. While transpor…
FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
Yi Jiang, Haoyu Hu, Dumitru Călugăru +5
The electronic structure and interactions of kagome materials, such as the 1:1 (FeGe) and 1:6:6 (MgFe6Ge6) classes, are complicated and involve many orbitals and bands around the F…
Dynamical correlations and order in magic-angle twisted bilayer graphene
Gautam Rai, Lorenzo Crippa, Dumitru Călugăru +8
In magic angle twisted bilayer graphene, transport, thermodynamic and spectroscopic experiments pinpoint at a competition between distinct low-energy states with and without electr…
Softening of a flat phonon mode in the kagome ScVSn
A. Korshunov, H. Hu, D. Subires +16
The long range electronic modulations recently discovered in the geometrically frustrated kagome lattice have opened new avenues to explore the effect of correlations in materials…
TBG as Topological Heavy Fermion: II. Analytical approximations of the model parameters
Dumitru Călugăru, Maksim Borovkov, Liam L. H. Lau +3
The recently-introduced Topological Heavy Fermion (THF) model [Phys. Rev. Lett. 129, 047601] of twisted bilayer graphene (TBG) aims to reconcile the quantum-dot-like electronic str…
Symmetric Kondo Lattice States in Doped Strained Twisted Bilayer Graphene
H. Hu, G. Rai, L. Crippa +7
We use the topological heavy fermion (THF) model and its Kondo Lattice (KL) formulation to study the symmetric Kondo state in twisted bilayer graphene. Via a large-N approximation,…
Thermal spin dynamics of Kitaev magnets scattering continua and magnetic field induced phases within a stochastic semiclassical approach
Oliver Franke, Dumitru Călugăru, Andreas Nunnenkamp +1
The honeycomb magnet RuCl is a prime candidate material for realizing the Kitaev quantum spin liquid (QSL), but it shows long-range magnetic order at low temperature. Never…
Spectroscopy of Twisted Bilayer Graphene Correlated Insulators
Dumitru Călugăru, Nicolas Regnault, Myungchul Oh +6
We analytically compute the scanning tunneling microscopy (STM) signatures of integer-filled correlated ground states of the magic angle twisted bilayer graphene (TBG) narrow bands…
General Construction and Topological Classification of All Magnetic and Non-Magnetic Flat Bands
Dumitru Călugăru, Aaron Chew, Luis Elcoro +3
Exotic phases of matter emerge from the interplay between strong electron interactions and non-trivial topology. Owing to their lack of dispersion at the single-particle level, sys…
TSTG I: Single-Particle and Many-Body Hamiltonians and Hidden Non-local Symmetries of Trilayer Moiré Systems with and without Displacement Field
Dumitru Călugăru, Fang Xie, Zhi-Da Song +3
We derive the Hamiltonian for trilayer moiré systems with the Coulomb interaction projected onto the bands near the charge neutrality point. Motivated by the latest experimental re…
Generalized Triple-Component Fermions: Lattice Model, Fermi arcs, and Anomalous Transport
Snehasish Nandy, Sourav Manna, Dumitru Calugaru +1
We generalize the construction of time-reversal symmetry-breaking triple-component semimetals, transforming under the pseudospin-1 representation, to arbitrary (anti-)monopole char…
Higher Order Topological Phases: A General Principle of Construction
Dumitru Calugaru, Vladimir Juricic, Bitan Roy
We propose a general principle for constructing higher-order topological (HOT) phases. We argue that if a -dimensional first-order or regular topological phase involves Herm…