When:
Thursday, September 28, 2017
4:00 PM - 5:30 PM CT
Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it
Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students
Contact:
Tina Hoff
Group: Physics and Astronomy Condensed Matter Physics Seminars
Category: Academic
Professor Anton Vorontsov, Montana State University
Title: Heat transport in domain walls of unconventional superconductors
Abstract:
Thermal transport is a powerful superconductivity probe requiring close synergy between experiment and theoretical support. I will describe general theoretical approach to calculation of energy transport in inhomogeneous superconductors. Such nonuniform states appear near pairbreaking surfaces, in confinement, or due to competing effects as in the Fulde-Ferrell-Larkin-Ovchinnikov state. We will look at the example of a domain wall in the superconducting order parameter and heat transport across and along the domain wall in d-wave and chiral superconductors.
The Andreev bound states in the nonuniform region affect the heat transport in several ways: (i) they result in Andreev reflection processes due to spatially-varying quasiparticle spectrum, and (ii) they hybridize with the impurity band producing a local transport environment with properties very different from those in a uniform superconductor. As a consequence, heat transport becomes highly anisotropic and explicitly non-local, with new features that depend on temperature, magnetic field, disorder and order parameter symmetry. For example, strongly scattering impurities result in a more efficient low-temperature heat transport than that in the uniform superconducting state.
Host: Jim Sauls