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Magic Angles and Fractional Chern Insulators in Twisted Homobilayer TMDs
Nicolás Morales-Durán, Nemin Wei, Jingtian Shi +1
We explain the appearance of magic angles and fractional Chern insulators in twisted K-valley homobilayer transition metal dichalcogenides by mapping their continuum model to a Lan…
Thermodynamic behavior of correlated electron-hole fluids in van der Waals heterostructures
Ruishi Qi, Andrew Y. Joe, Zuocheng Zhang +12
Coupled two-dimensional electron-hole bilayers provide a unique platform to study strongly correlated Bose-Fermi mixtures in condensed matter. Electrons and holes in spatially sepa…
Magnetic States of Graphene Proximitized Kitaev Materials
Jingtian Shi, A. H. MacDonald
Single layer -ruthenium trichloride () has been proposed as a potential quantum spin liquid. Graphene/ heterobilayers have been extensively studied with…
High-accuracy variational Monte Carlo for frustrated magnets with deep neural networks
Christopher Roth, Attila Szabó, Allan MacDonald
We show that neural quantum states based on very deep (4--16-layered) neural networks can outperform state-of-the-art variational approaches on highly frustrated quantum magnets, i…
Magnetism and Quantum Melting in Moiré-Material Wigner Crystals
Nicolás Morales-Durán, Pawel Potasz, Allan H. MacDonald
Recent experiments have established that semiconductor-based moiré materials can host incompressible states at a series of fractional moiré-miniband fillings. These states have bee…
Magnetic ground states of honeycomb lattice Wigner crystals
Nitin Kaushal, Nicolás Morales-Durán, Allan H. MacDonald +1
Lattice Wigner crystal states stabilized by long-range Coulomb interactions have recently been realized in two-dimensional moiré materials. We employ large-scale unrestricted Hartr…
Layer Pseudospin Magnetism in Transition-Metal-Dichalcogenide Double-Moirés
Yongxin Zeng, Nemin Wei, Allan H. MacDonald
Spontaneous order of layer pseudospins in two-dimensional bilayers is common in quantum Hall systems, where it is responsible for hysteretic responses to gate fields in states with…
Gate-tunable heavy fermion quantum criticality in a moiré Kondo lattice
Ajesh Kumar, Nai Chao Hu, Allan H. MacDonald +1
We propose a realization of Kondo-lattice physics in moiré superlattices at the interface between a WX homobilayer and MoX monolayer (where X=S,Se). Under appropriate gatin…
Competing magnetic states in transition metal dichalcogenide moiré materials
Nai Chao Hu, Allan H. MacDonald
Small-twist-angle transition metal dichalcogenide (TMD) heterobilayers develop isolated flat moiré bands that are approximately described by triangular lattice generalized Hubbard…
Non-local interactions in moiré Hubbard systems
Nicolás Morales-Durán, Nai Chao Hu, Pawel Potasz +1
Moiré materials formed in two-dimensional semiconductor heterobilayers are quantum simulators of Hubbard-like physics with unprecedented electron-density and interaction-strength t…
Spin excitations in metallic kagome lattice FeSn and CoSn
Yaofeng Xie, Lebing Chen, Tong Chen +11
In two-dimensional (2D) metallic kagome lattice materials, destructive interference of electronic hopping pathways around the kagome bracket can produce nearly localized electrons,…
Metamagnetism of few layer topological antiferromagnets
C. Lei, O. Heinonen, A. H. MacDonald +1
MnBiTe (MBT) is a promising antiferromagnetic topological insulator whose films provide access to novel and technologically important topological phases, including quantum…
Exact Diagonalization for Magic-Angle Twisted Bilayer Graphene
Pawel Potasz, Ming Xie, Allan H. MacDonald
We report on finite-size exact-diagonalization calculations in a Hilbert space defined by the continuum-model flat moiré bands of magic angle twisted bilayer graphene (MATBG). For…
Metal-insulator transition in transition metal dichalcogenide heterobilayer moiré superlattices
Nicolás Morales-Durán, Pawel Potasz, Allan H. MacDonald
Moiré superlattices formed in two-dimensional semiconductor heterobilayers provide a new realization of Hubbard model physics in which the number of electrons per effective atom ca…
Lattice Collective Modes from a Continuum Model of Magic-Angle Twisted Bilayer Graphene
Ajesh Kumar, Ming Xie, A. H. MacDonald
We show that the insulating states of magic-angle twisted bilayer graphene support a series of collective modes corresponding to local particle-hole excitations on triangular latti…
-Valley Transition-Metal-Dichalcogenide Moirè Bands
M. Angeli, A. H. MacDonald
The valence band maxima of most group-VI transition metal dichalcogenide thin films remain at the -point all the way from bulk to bilayer. In this paper we develop a continuum t…
Theory of ARPES in Graphene-Based Moiré Superlattices
Jihang Zhu, Jingtian Shi, Allan H. MacDonald
Graphene-based moiré superlattices are now established as an interesting platform for strongly-correlated many-electron physics, and have so far been characterized mainly by transp…
Electrical switching of magnetic order in an orbital Chern insulator
Hryhoriy Polshyn, Jihang Zhu, Manish A. Kumar +8
Magnetism typically arises from the joint effect of Fermi statistics and repulsive Coulomb interactions, which favors ground states with non-zero electron spin. As a result, contro…
Voltage-Controlled Magnetic Reversal in Orbital Chern Insulators
Jihang Zhu, Jung-Jung Su, Allan H. MacDonald
Chern insulator ferromagnets are characterized by a quantized anomalous Hall effect, and have so far been identified experimentally in magnetically-doped topological insulator (MTI…
Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
Xiaobo Lu, Petr Stepanov, Wei Yang +10
Superconductivity often occurs close to broken-symmetry parent states and is especially common in doped magnetic insulators. When twisted close to a magic relative orientation angl…
Anomalous Drag in Double Bilayer Graphene Quantum-Hall Superfluids
Ming Xie, Allan H. MacDonald
Semiconductor double-layers in the quantum Hall regime tend to have superfluid exciton condensate ground states when the total filling factor is an odd integer, provided that the L…
Tunneling density of states, correlation energy, and spin polarization in the fractional quantum Hall regime
Gaurav Chaudhary, Dmitry K. Efimkin, Allan H. MacDonald
We derive exact sum-rules that relate the tunneling density of states (TDOS) of spinful electrons in the fractional quantum Hall (FQH) regime to the spin-dependent many body ground…
Collective modes of Dirac and Weyl semimetals in strong magnetic fields
John R. Tolsma, Fengcheng Wu, Allan H. MacDonald
Dirac and Weyl semimetals provide a new example of three-dimensional electron gases which are sensitive to strong magnetic fields. In this paper we address their collective excitat…
Orbital and spin order in oxide two-dimensional electron gases
John R. Tolsma, Marco Polini, Allan H. MacDonald
We describe a variational theory of multi-band two-dimensional electron gases that captures the interplay between electrostatic confining potentials, orbital-dependent interlayer e…