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RESEARCH PRODUCT
Flat-band superconductivity in strained Dirac materials
V. J. KauppilaFaluke AikebaierTero T. Heikkiläsubject
superconducting propertiesMaterials sciencesuprajohtavuusDirac (software)FOS: Physical sciences02 engineering and technology01 natural scienceslaw.inventionsuprajohteetSuperconductivity (cond-mat.supr-con)Condensed Matter::Materials SciencelawUltracold atompuolijohteetCondensed Matter::Superconductivity0103 physical sciencesgrafeeniGraphite010306 general physicsSuperconductivityLocal density of statesCondensed matter physicsta114Dirac materialsGrapheneCondensed Matter - SuperconductivityIsotropySupercurrent021001 nanoscience & nanotechnology0210 nano-technologydescription
We consider superconducting properties of a two-dimensional Dirac material such as graphene under strain that produces a flat band spectrum in the normal state. We show that in the superconducting state, such a model results in a highly increased critical temperature compared to the case without the strain, inhomogenous order parameter with two-peak shaped local density of states and yet a large and almost uniform and isotropic supercurrent. This model could be realized in strained graphene or ultracold atom systems and could be responsible for unusually strong superconductivity observed in some graphite interfaces and certain IV-VI semiconductor heterostructures.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-01-18 | Physical Review B |