Superconductors with multi-component order parameter: novel mesoscopic effects and topological states

Date: 26 October 2016

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

Time: 4:00 PM - 5:00 PM

Organization / co-organization: Condensed Matter Theory group

Short description: Condensed Matter Theory seminar presented by Victor Becerra



Abstract

The archetypal example of a superconductor with multi-component order parameter and breaking the time-reversal symmetry is the chiral p-wave model of superconductivity. This model, extensively studied due to its topological properties, predicts the flow of spontaneous currents along the edges in a similar way as in the quantum Hall effect. However, in strontium ruthenate, the leading candidate to display chiral superconductivity, the spontaneous currents have remained eluded so far despite intense scrutiny.

In this talk, within the Ginzburg-Landau model, Victor Beccera will study the effect of confinement on the ground states of mesoscopic chiral p-wave superconductors in absence of magnetic field. He will show that states with domain walls separating regions with different chiralities, exhibit identifying signatures in the spatial profile of the magnetic field, if those are not screened by edge currents in the case of strong confinement.

Furthermore, he will also show that coreless vortices (skyrmions) with topology and electronic properties distinctly different from that of conventional Abrikosov vortices, are made stable when an external magnetic field is applied. Finally, Victor Beccera will suggest, based on the dynamic response of skyrmions and edge states to an external applied current, new fingerprints for the identification of p-wave superconductivity.



Contact email: lucian.covaci@uantwerpen.be

Link: http://cmt.uantwerpen.be