131 citations · 984 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…
Relativistic Mott transitions and finite-temperature effects of quantum criticality in Dirac semimetals
Mireia Tolosa-Simeón, Laura Classen, Michael M. Scherer
Gross-Neveu-Yukawa-type models such as the chiral Ising, chiral XY, and chiral Heisenberg models, serve as effective descriptions of two-dimensional Dirac semi-metals undergoing qu…
Mean-field analysis of a Hubbard interaction on Bernal Bilayer Graphene
Robin Scholle, Laura Classen
We perform unrestricted Hartree-Fock calculations on the 2D Hubbard model on a honeycomb and bilayer honeycomb lattice at both zero and finite temperatures. Finite size real space…
Angle-Tuned Gross-Neveu Quantum Criticality in Twisted Bilayer Graphene: A Quantum Monte Carlo Study
Cheng Huang, Nikolaos Parthenios, Maksim Ulybyshev +4
The fascinating quantum many-body states in twisted bilayber graphene (TBG) at magic angle, due to the interplay of Coulomb interactions and the quantum metrics of flat bands, have…
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…
Kohn-Luttinger-like mechanism for unconventional charge density waves
Hannes Braun, Michael M. Scherer, Laura Classen
Interaction-induced charge orders with electronic origin occur as states of spontaneously broken symmetry in several materials platforms. An electronic mechanism for charge order r…
High-order Van Hove singularities and their connection to flat bands
Laura Classen, Joseph J. Betouras
The flattening of single-particle band structures plays an important role in the quest for novel quantum states of matter due to the crucial role of interactions. Recent advances i…
Field-control of symmetry-broken and quantum disordered phases in frustrated moiré bilayers with population imbalance
Lorenzo Del Re, Laura Classen
We determine the ground states and excitation spectra of the paradigmatic four-flavour Heisenberg model with nearest- and next-nearest-neighbor exchange couplings on the triangular…
Twisted bilayer graphene at charge neutrality: competing orders of SU(4) Dirac fermions
Nikolaos Parthenios, Laura Classen
We study possible patterns for spontaneous symmetry breaking in a Dirac fermion model, which is applicable to twisted bilayer graphene at charge neutrality. We show how a chiral SU…
Cascade of transitions in twisted and non-twisted graphene layers within the van Hove scenario
Dmitry V. Chichinadze, Laura Classen, Yuxuan Wang +1
Motivated by measurements of compressibility and STM spectra in twisted bilayer graphene, we analyze the pattern of symmetry breaking for itinerant fermions near a van Hove singula…
Functional renormalization of spinless triangular-lattice fermions: -patch vs. truncated-unity scheme
Nico Gneist, Dominik Kiese, Ravn Henkel +3
We study competing orders of spinless fermions in the triangular-lattice Hubbard model with nearest-neighbor interaction. We calculate the effective, momentum-resolved two-particle…
Competition of Density Waves and Superconductivity in Twisted Tungsten Diselenide
Lennart Klebl, Ammon Fischer, Laura Classen +2
Evidence for correlated insulating and superconducting phases around regions of high density of states was reported in the strongly spin-orbit coupled van-der Waals material twiste…
Competing instabilities of the extended Hubbard model on the triangular lattice: Truncated-unity functional renormalization group and application to moiré materials
Nico Gneist, Laura Classen, Michael M. Scherer
A simple yet paradigmatic model for the interplay of strong electronic correlations and geometric frustration is the triangular lattice Hubbard model. Recently it was proposed that…
Interaction-induced velocity renormalization in magic angle twisted trilayer graphene
Laura Classen, J. H. Pixley, Elio J. König
Twistronics heterostructures provide a novel route to control the electronic single particle velocity and thereby to engineer strong effective interactions. Here we show that the r…
chiral superconductivity in moiré transition metal dichalcogenides
Michael M. Scherer, Dante M. Kennes, Laura Classen
Experimental demonstrations of tunable correlation effects in magic-angle twisted bilayer graphene have put two-dimensional moiré quantum materials at the forefront of condensed-ma…
SU(4) symmetry in twisted bilayer graphene - an itinerant perspective
Dmitry V. Chichinadze, Laura Classen, Yuxuan Wang +1
We study symmetry-broken phases in twisted bilayer graphene at small filling above charge neutrality and at Van Hove filling. We argue that the Landau functionals for the particle-…
Superconductivity of incoherent electrons in Yukawa-SYK model
Laura Classen, Andrey Chubukov
We study a model of fermions in a quantum dot, coupled to bosons by a disorder-induced complex Yukawa coupling (Yukawa-SYK model), in order to explore the interplay between…
Valley magnetism, nematicity, and density wave orders in twisted bilayer graphene
Dmitry V. Chichinadze, Laura Classen, Andrey V. Chubukov
We analyze density-wave and Pomeranchuk orders in twisted bilayer graphene. This compliments our earlier analysis of the pairing instabilities. We assume that near half-filling of…
Competing orders at higher-order Van Hove points
Laura Classen, Andrey V. Chubukov, Carsten Honerkamp +1
Van Hove points are special points in the energy dispersion, where the density of states exhibits analytic singularities. When a Van Hove point is close to the Fermi level, tendenc…
Nematic superconductivity in twisted bilayer graphene
Dmitry V. Chichinadze, Laura Classen, Andrey V. Chubukov
Twisted bilayer graphene displays insulating and superconducting phases caused by exceptional flattening of its lowest energy bands. Superconductivity with highest appears at…
Signatures of coupling between spin waves and Dirac fermions in YbMnBi
A. Sapkota, L. Classen, M. B. Stone +6
We present inelastic neutron scattering (INS) measurements of magnetic excitations in YbMnBi, which reveal features consistent with a direct coupling of magnetic excitations to…
Competing phases of interacting electrons on triangular lattices in moiré heterostructures
Laura Classen, Carsten Honerkamp, Michael M. Scherer
We study the quantum many-body instabilities of interacting electrons with SU(2)SU(2) symmetry in spin and orbital degrees of freedom on the triangular lattice near van-Hov…
Ladder-like optical conductivity in the spin-fermion model
Laura Classen, Neil J. Robinson, Alexei M. Tsvelik
In the nested limit of the spin-fermion model for the cuprates, one-dimensional physics in the form of half-filled two-leg ladders emerges. We show that the renormalization group f…
Orbital order in FeSe - the case for vertex renormalization
Rui-Qi Xing, Laura Classen, Andrey V. Chubukov
We study the structure of the d-wave orbital order in FeSe in light of recent STM and ARPES data, which detect the shapes of hole and electron pockets in the nematic phase. The geo…