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Universal phase diagrams with superconducting domes for electronic flat bands
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 6, 064505Article in journal (Refereed) Published
Abstract [en]

Condensed matter systems with flat bands close to the Fermi level generally exhibit, due to their very large density of states, extraordinarily high critical ordering temperatures of symmetry-breaking orders, such as superconductivity and magnetism. Here we show that the critical temperatures follow one of two universal curves with doping away from a flat band depending on the ordering channel, which completely dictates both the general order competition and the phase diagram. Notably, we find that orders in the particle-particle channel (superconducting orders) survive decisively farther than orders in the particle-hole channel (magnetic or charge orders) because the channels have fundamentally different polarizabilities. Thus, even if a magnetic or charge order initially dominates, superconducting domes are still likely to exist on the flanks of flat bands. We apply these general results to both the topological surface flat bands of rhombohedral ABC-stacked graphite and to the Van Hove singularity of graphene.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 6, 064505
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-334050DOI: 10.1103/PhysRevB.96.064505ISI: 000406860300007OAI: oai:DiVA.org:uu-334050DiVA: diva2:1158856
Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-29Bibliographically approved

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Löthman, TomasBlack-Schaffer, Annica M.

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