Intrinsic quantized anomalous Hall effect in a moiré heterostructure

M Serlin, CL Tschirhart, H Polshyn, Y Zhang, J Zhu… - Science, 2020 - science.org
The quantum anomalous Hall (QAH) effect combines topology and magnetism to produce
precisely quantized Hall resistance at zero magnetic field. We report the observation of a …

Ground state and hidden symmetry of magic-angle graphene at even integer filling

N Bultinck, E Khalaf, S Liu, S Chatterjee, A Vishwanath… - Physical Review X, 2020 - APS
In magic angle twisted bilayer graphene (TBG), electron-electron interactions play a central
role, resulting in correlated insulating states at certain integer fillings. Identifying the nature …

Kekulé spiral order at all nonzero integer fillings in twisted bilayer graphene

YH Kwan, G Wagner, T Soejima, MP Zaletel, SH Simon… - Physical Review X, 2021 - APS
We study magic angle graphene in the presence of both strain and particle-hole symmetry
breaking due to nonlocal interlayer tunneling. We perform a self-consistent Hartree-Fock …

Charged skyrmions and topological origin of superconductivity in magic-angle graphene

E Khalaf, S Chatterjee, N Bultinck, MP Zaletel… - Science …, 2021 - science.org
Topological solitons, a class of stable nonlinear excitations, appear in diverse domains as in
the Skyrme model of nuclear forces. Here, we argue that similar excitations play an …

Spontaneous fractional Chern insulators in transition metal dichalcogenide moiré superlattices

H Li, U Kumar, K Sun, SZ Lin - Physical Review Research, 2021 - APS
The Moiré superlattice realized in two-dimensional heterostructures offers an exciting
platform to access strongly correlated electronic states. In this work, we study transition metal …

Nematic topological semimetal and insulator in magic-angle bilayer graphene at charge neutrality

S Liu, E Khalaf, JY Lee, A Vishwanath - Physical Review Research, 2021 - APS
We report on a fully self-consistent Hartree-Fock calculation of interaction effects on the
moiré flat bands of twisted bilayer graphene, assuming that valley U (1) symmetry is …

Symmetric kondo lattice states in doped strained twisted bilayer graphene

H Hu, G Rai, L Crippa, J Herzog-Arbeitman… - Physical review …, 2023 - APS
We use the topological heavy fermion (THF) model and its Kondo lattice (KL) formulation to
study the possibility of a symmetric Kondo (SK) state in twisted bilayer graphene. Via a large …

Untwisting moiré physics: Almost ideal bands and fractional Chern insulators in periodically strained monolayer graphene

Q Gao, J Dong, P Ledwith, D Parker, E Khalaf - Physical Review Letters, 2023 - APS
Moiré systems have emerged in recent years as a rich platform to study strong correlations.
Here, we will propose a simple, experimentally feasible setup based on periodically strained …

Emulating heavy fermions in twisted trilayer graphene

A Ramires, JL Lado - Physical Review Letters, 2021 - APS
Twisted van der Waals materials have been shown to host a variety of tunable electronic
structures. Here we put forward twisted trilayer graphene (TTG) as a platform to emulate …

Symmetry breaking and skyrmionic transport in twisted bilayer graphene

S Chatterjee, N Bultinck, MP Zaletel - Physical Review B, 2020 - APS
Motivated by recent low-temperature magnetoresistance measurements in twisted bilayer
graphene aligned with hexagonal boron nitride substrate, we perform a systematic study of …