| Description: | [DPS Colloquium] Prof. Mohit Randeria (Ohio State University, USA) -- Are There Bounds on the Superconducting Transition Temperature? |
| Date: | Thursday, Apr 18, 2024 |
| Time: | 4:30 p.m. - 6 p.m. |
| Venue: | Asima Chatterjee Lecture Theatre |
| Details: | The question of understanding limits on the superconducting transition temperature Tc is of great fundamental and technological importance. I will begin with a pedagogical introduction to this question aimed at non-specialists. I will then describe recent progress on deriving exact upper bounds on the Tc of 2D superconductors applicable to a wide range of quantum materials and to ultracold atomic gases. I will illustrate the usefulness of these bounds by making contact with recent experiments on a variety of systems where standard BCS theory fails. Next, motivated by twisted bilayer graphene, I will show how our bounds need to be generalized when the band structure exhibits non-trivial topology or lacks dispersion, i.e., flat band superconductivity. I will conclude by discussing why the question of obtaining general upper bounds on Tc in 3D remains an open challenge. |
| Calendar: | Seminar Calendar (entered by rajni) |