Moire & 2D Superconductivity
Magic-angle graphene, twisted transition-metal dichalcogenides, rhombohedral multilayer graphene and chiral or unconventional 2D superconductivity.
Most influential
- Unconventional superconductivity in magic-angle graphene superlattices
The understanding of strongly-correlated materials, and in particular unconventional superconductors, has puzzled physicists for decades. Such difficulties have stimulated new research paradigms, such as ultra-cold atom lattices for simulating quantum materials. Here we report on the realization of intrinsic unconventional superconductivity in a 2D superlatt…
Article8,329 citationsarXiv:1803.02342doi:10.1038/nature26160 - Correlated insulator behaviour at half-filling in magic-angle graphene superlattices
Van der Waals (vdW) heterostructures are an emergent class of metamaterials comprised of vertically stacked two-dimensional (2D) building blocks, which provide us with a vast tool set to engineer their properties on top of the already rich tunability of 2D materials. One of the knobs, the twist angle between different layers, plays a crucial role in the ulti…
Article4,884 citationsarXiv:1802.00553doi:10.1038/nature26154 - Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene
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 angle near 1 degree, bilayer graphene has flat moire superlattice minibands that have emerged as a rich and highly tunable source of strong correlation physics, notably the appearance …
Article1,597 citationsarXiv:1903.06513doi:10.1038/s41586-019-1695-0 - Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene
Moiré superlattices have recently emerged as a novel platform where correlated physics and superconductivity can be studied with unprecedented tunability. Although correlated effects have been observed in several other moiré systems, magic-angle twisted bilayer graphene (MATBG) remains the only one where robust superconductivity has been reproducibly measure…
Article857 citationsarXiv:2012.01434doi:10.1038/s41586-021-03192-0 - Graphene bilayers with a twist
Near a magic twist angle, bilayer graphene transforms from a weakly correlated Fermi liquid to a strongly correlated two-dimensional electron system with properties that are extraordinarily sensitive to carrier density and to controllable environmental factors such as the proximity of nearby gates and twist-angle variation. Among other phenomena magic-angle …
Review913 citationsarXiv:2008.08129doi:10.1038/s41563-020-00840-0 - Maximized electron interactions at the magic angle in twisted bilayer graphene
The electronic properties of heterostructures of atomically-thin van der Waals (vdW) crystals can be modified substantially by Moiré superlattice potentials arising from an interlayer twist between crystals. Moiré-tuning of the band structure has led to the recent discovery of superconductivity and correlated insulating phases in twisted bilayer graphene (TB…
Article936 citationsarXiv:1812.08776doi:10.1038/s41586-019-1431-9 - Origin of Magic Angles in Twisted Bilayer Graphene
Twisted Bilayer graphene (TBG) is known to feature isolated and relatively flat bands near charge neutrality, when tuned to special magic angles. However, different criteria for the magic angle such as the vanishing of Dirac speed, minimal bandwidth or maximal band gap to higher bands typically give different results. Here we study a modified continuum model…
Article791 citationsarXiv:1808.05250doi:10.1103/physrevlett.122.106405 - Tunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene
The recent discovery of correlated insulator states and superconductivity in magic-angle twisted bilayer graphene has paved the way to the experimental investigation of electronic correlations in tunable flat band systems realized in twisted van der Waals heterostructures. This novel twist angle degree of freedom and control should be generalizable to other …
Article674 citationsarXiv:1903.08596doi:10.1038/s41586-020-2260-6 - Signatures of tunable superconductivity in a trilayer graphene moiré superlattice
Understanding the mechanism of high temperature (high Tc) superconductivity is a central problem in condensed matter physics. It is often speculated that high Tc superconductivity arises from a doped Mott insulator as described by the Hubbard model. An exact solution of the Hubbard model, however, is extremely challenging due to the strong electron-electron …
Article668 citationsarXiv:1901.04621doi:10.1038/s41586-019-1393-y - Spectroscopic signatures of many-body correlations in magic angle twisted bilayer graphene
The discovery of superconducting and insulating states in magic angle twisted bilayer graphene (MATBG) has ignited considerable interest in understanding the nature of electronic interactions in this chemically pristine material system. The phenomenological similarity of the MATBG transport properties as a function of doping with those of the high-Tc cuprate…
Article665 citationsarXiv:1906.09274doi:10.1038/s41586-019-1422-x - Tunable spin-polarized correlated states in twisted double bilayer graphene
Ferromagnetism and superconductivity typically compete with each other since the internal magnetic field generated in a magnet suppresses the formation of spin-singlet Cooper pairs in conventional superconductors. Only a handful of ferromagnetic superconductors are known in heavy fermion systems, where many-body electron interactions promoted by the narrow e…
Article618 citationsarXiv:1903.08130doi:10.1038/s41586-020-2458-7 - Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene
We construct a van der Waals heterostructure consisting of three graphene layers stacked with alternating twisting angles $\pmθ$. At the average twist angle $θ\sim 1.56^{\circ}$, a theoretically predicted magic angle for the formation of flat electron bands, narrow conduction and valence moiré bands appear together with a linearly dispersing Dirac band. Upon…
Article518 citationsarXiv:2012.02773doi:10.1126/science.abg0399 - Strange Metal in Magic-Angle Graphene with near Planckian Dissipation
Recent experiments on magic-angle twisted bilayer graphene have discovered correlated insulating behavior and superconductivity at a fractional filling of an isolated narrow band. In this paper we show that magic-angle bilayer graphene exhibits another hallmark of strongly correlated systems --- a broad regime of $T-$linear resistivity above a small, density…
Article528 citationsarXiv:1901.03710doi:10.1103/physrevlett.124.076801 - Untying the insulating and superconducting orders in magic-angle graphene
The coexistence of superconducting and correlated insulating states in magic-angle twisted bilayer graphene prompts fascinating questions about the relationship of these orders. Independent control of the microscopic mechanisms governing these phases could help uncover their individual roles and shed light on their intricate interplay. Here we report on dire…
Article511 citationsarXiv:1911.09198doi:10.1038/s41586-020-2459-6 - Tuning electron correlation in magic-angle twisted bilayer graphene using Coulomb screening
The ability to control the strength of interaction is essential for studying quantum phenomena emerging from a system of correlated fermions. For example, the isotope effect illustrates the effect of electron-phonon coupling on superconductivity, providing an important experimental support for the BCS theory. In this work, we report a new device geometry whe…
Article274 citationsarXiv:2003.11072doi:10.1126/science.abb8754
Newest work
- Vortex anisotropy in chiral and nematic superconductors with strainPreprintarXiv:2610.36358
- Chiral Superconductivity Adjacent to a Wigner Crystal in Rhombohedral GraphenePreprintarXiv:2610.33808
- Nano-ARPES observation of a flat band at the \bar{M} point in 2.4° twisted bilayer graphenePreprintarXiv:2610.32714
- Quantum Oscillations across Hole Crystallization in Rhombohedral GraphenePreprintarXiv:2610.27134
- Interaction-driven competing instabilities in two-dimensional checkerboard quadratic band crossing semimetalsPreprintarXiv:2610.25046
- Attraction from repulsion in an interacting Chern band: chiral superconductivity, generalized Hall crystals, and competing fractional Chern insulatorsPreprintarXiv:2610.22498
- Valley-Selective Transport through Structural Domain Walls in Rhombohedral Graphene Quarter MetalsPreprintarXiv:2610.22521
- Metallic electron crystals in rhombohedral graphene as a bridge to twisted WSe$_2$PreprintarXiv:2610.20553
- Nodal nematic superconductivity in moiré graphenePreprintarXiv:2610.20605
- A Full-Spectrum Theory of Moiré SuperlatticesPreprintarXiv:2610.17749