Unconventional Superconductivity in Sr2RuO4

Date: 31 August 2016

Venue: Building U, room U.241 - Groeneborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Organization / co-organization: CMT

Short description: Condensed Matter Theory seminar presented by Thomas Scaffidi from University of Oxford

Unconventional Superconductivity in Sr2RuO4

Sr2RuO4 is one of the very few candidates for p+ip superconductivity. Besides the fundamental importance of firmly establishing the existence of a spin-triplet-paired superconductor, the interest in Sr2RuO4 also emanates from its potential as a resource towards topological quantum computation, since a p+ip superconductor can host vortices with a Majorana bound state at its core. The current race for robustly encoding and processing quantum information using Majorana bound states makes this problem very timely. 
In this talk, I will review the progress recently made in the understanding of this material. Using a spin-orbit-coupled weak-coupling calculation, I will analyze the results of several recent experiments: the absence of measurable edge currents observed by magnetometry, the absence of cusp of Tc versus uniaxial strain, and the nodal behavior observed for example in the specific heat. I will show that, in each case, the results do not invalidate the presence of a p+ip state. I will also discuss the evolution of the superconducting state at a Van Hove singularity, which was recently reached experimentally by applying uniaxial strain.

CMT seminar presented by Thomas Scaffidi from University of Oxford

Contact email: lucian.covaci@uantwerpen.be

Link: http://cmt.uantwerpen.be