Flat-band superconductivity in strained Dirac materials
Kauppila, V. J.; Aikebaier, Faluke; Heikkilä, Tero (2016). Flat-band superconductivity in strained Dirac materials. Physical Review B, 93 (21), 214505. DOI: 10.1103/PhysRevB.93.214505
Published inPhysical Review B
© 2016 American Physical Society. Published in this repository with the kind permission of the publisher.
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, inhomogeneous 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.