English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Magic-angle twisted bilayer graphene (TBG) exhibits a captivating phasediagram as a function of doping, featuring superconductivity and a variety ofinsulating and magnetic states. The bands host Dirac fermions with a reducedFermi velocity; experiments have shown that the Dirac dispersion reappears nearinteger fillings of the moir\'e unit cell -- referred to as the $\textit{Diracrevival}$ phenomenon. The reduced velocity of these Dirac states leads us topropose a scenario in which the Dirac fermions possess an approximatelyquadratic dispersion. The quadratic momentum dependence and particle-holedegeneracy at the Dirac point results in a logarithmic enhancement ofinteraction effects, which does not appear for a linear dispersion. Theresulting non-trivial renormalisation group (RG) flow naturally produces thequalitative phase diagram as a function of doping -- with nematic andinsulating states near integer fillings, which give way to superconductingstates past a critical relative doping. The RG method further producesdifferent results to strong-coupling Hartree-Fock treatments: producing T-IVCinsulating states for repulsive interactions, explaining the results of veryrecent STM experiments, alongside nodal $A_2$ superconductivity nearhalf-filling, whose properties explain puzzles in tunnelling studies of thesuperconducting state. The model explains a diverse range of additionalexperimental observations, unifying many aspects of the phase diagram of TBG.

Quadratic Dirac fermions and the competition of ordered states in twisted bilayer graphene