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TT: Fachverband Tiefe Temperaturen

TT 99: Superconductivity: (General) Theory 2

TT 99.9: Vortrag

Donnerstag, 19. März 2015, 17:15–17:30, H 2053

Collective modes in superconducting rhombohedral graphite — •Ville Kauppila1, Timo Hyart2, and Tero Heikkilä21O.V. Lounasmaa Laboratory, Aalto University, Finland — 2University of Jyväskylä, Finland

Recently it was realized that coupling particles with a Dirac dispersion (such as electrons in graphene) can lead to a topologically protected state with flat band dispersion. Such a state could support superconductivity with unusually high critical temperatures[1]. Perhaps the most promising way to realize such coupling in real materials is in the surface of rhombohedrally stacked graphite.

We consider collective excitations (i.e. the Higgs modes) in surface superconducting rhombohedral graphite. We find two amplitude and two phase modes corresponding to the two surfaces of the graphite where the superconductivity lives. We calculate the dispersion of these modes. We also derive the Ginzburg-Landau theory for this material. We show that in superconducting rhombohedral graphite, the collective modes, unlike in conventional BCS superconductors, give a large contribution to thermodynamic properties of the material.


[1] T.T. Heikkila, N.B. Kopnin, G.E. Volovik,

Phys. Rev. B 83, 220503(R) (2011)

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin