R. G. Herb Condensed Matter Seminars |
Events During the Week of November 6th through November 12th, 2022
Monday, November 7th, 2022
- No events scheduled
Tuesday, November 8th, 2022
- No events scheduled
Wednesday, November 9th, 2022
- No events scheduled
Thursday, November 10th, 2022
- Scanning tunneling spectroscopy of unconventional superconductors
- Time: 10:00 am - 11:00 am
- Place: 5310 Chamberlin
- Speaker: Pavlo Sukhachov, Yale
- Abstract: Motivated by recent experimental observations of unconventional superconductivity in twisted bilayer and trilayer graphenes, we develop a theory describing the differential conductance between a normal STM tip and a 2D superconductor with an arbitrary gap structure. Our analytical scattering theory accounts for Andreev reflections, which become prominent at larger transmission between the tip and the superconductor. Exploiting the dependence of Andreev reflection on the relative position of the STM tip with respect to the lattice symmetry points, we show that the structure of the superconducting gap can be extracted by combining weak- and strong-tunneling limits of differential conductance. Furthermore, the theory incorporates a tip-induced scattering potential within the 2D material, which allows us to describe subgap resonances.
- Host: Alex Levchenko
Friday, November 11th, 2022
- No events scheduled