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Unconventional superconductivity in nearly flat bands in twisted bilayer graphene
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).ORCID-id: 0000-0002-3000-5393
Rekke forfattare: 22019 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, nr 12, artikkel-id 121407Artikkel i tidsskrift (Fagfellevurdert) 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.

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2019. Vol. 99, nr 12, artikkel-id 121407
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URN: urn:nbn:se:su:diva-167462DOI: 10.1103/PhysRevB.99.121407ISI: 000461962900001OAI: oai:DiVA.org:su-167462DiVA, id: diva2:1302257
Tilgjengelig fra: 2019-04-04 Laget: 2019-04-04 Sist oppdatert: 2019-12-09bibliografisk kontrollert

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