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Unconventional superconductivity in nearly flat bands in twisted bilayer graphene
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 22019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 12, article id 121407Article in journal (Refereed) Published
Abstract [en]

Flat electronic bands can accommodate a plethora of interaction-driven quantum phases, since kinetic energy is quenched therein and electronic interactions therefore prevail. Twisted bilayer graphene, near the so-called magic angles, features slow Dirac fermions close to the charge-neutrality point that persist up to high energies. Starting from a continuum model of slow but strongly interacting Dirac fermions, we show that with increasing chemical doping away from the charge-neutrality point, a time-reversal symmetry breaking, valley pseudospin-triplet, topological p + ip superconductor gradually sets in, when the system resides at the brink of an antiferromagnetic ordering (due to Hubbard repulsion), in qualitative agreement with recent experimental findings. The p ip paired state exhibits quantized spin and thermal Hall conductivities, and polar Kerr and Faraday rotations. Our conclusions should also be applicable for other correlated two-dimensional Dirac materials.

Place, publisher, year, edition, pages
2019. Vol. 99, no 12, article id 121407
National Category
Materials Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-167462DOI: 10.1103/PhysRevB.99.121407ISI: 000461962900001OAI: oai:DiVA.org:su-167462DiVA, id: diva2:1302257
Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved

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Juricic, Vladimir
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