Seminarium om kondenserade materiens fysik - Alexander Zyuzin

Alexander Zyuzin: Preformed Cooper pairs in flat-band semimetals

Abstract

I will talk about the conditions for the emergence of the preformed Cooper pairs in materials hosting flat bands. 

As a particular example, I will consider a semimetal with a pair of three-band crossing points at which a flat band intersects with a Dirac cone. 

I will argue that the nearly dispersionless nature of the flat band promotes local Cooper pair formation so that the system may be modeled as an array of superconducting grains. On the other hand, Andreev scattering between the grains, thanks to the dispersive bands, gives rise to the phase-coherent superconductivity at low temperatures. I will talk about how to calculate transition temperature between the preformed Cooper pair state and the phase-coherent state. 

A.A. Zyuzin and A. Yu. Zyuzin, arxiv: 2109.07520.

Seminariet hålls digitalt via Zoom

Zoom-länk: https://nordita.org/zoom/nvcms

Läs mer om seminarieserien

Seminarium om kondenserade materiens fysik