CM & STAT. PHYSICS - Disorder and Strong Electron Correlations

[de_comel]

Condensed Matter and Statistical Physics Section
SEMINAR on Disorder and Strong Electron Correlations


Thursday, 6 June 2013  at 11.30 a.m.

Venue:  Luigi Stasi Lecture Hall, ICTP Leonardo Building, 1st floor


Speaker:
RONNY THOMALE
Ecole Polytechnique Fédérale de Lausanne, Switzerland


Title:
New Paths to Unconventional Topological Superconductivity


Abstract:
We report on our recent progress regarding classes of materials
which exhibit chiral triplet and singlet superconductivity, where 
topologically nontrivial pairing phenomena can emerge. Specifically, 
motivated by recent experimental advances, we show that graphene doped 
to the van Hove regime can give rise to a plethora of interesting 
ordering instabilities such as spin density wave and superconductivity. 
As a function of system parameters such as doping and range of Coulomb 
interaction, we explain which instability is favored by the system, and 
analyze the effect of long-range interactions on superconductivity 
giving rise to a competition between singlet d+id and triplet f wave. We 
further report on our investigations of Cobaltate superconductors where 
we believe the experimental evidence can be reconciled by an anisotropic 
d+id superconducting gap. We also outline our work in progress for other 
compounds such as strontium ruthenate and SrPtAs which we believe are 
promising to stabilize such interesting topological superconducting 
states of matter.