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  4. Condensed Matter Physics Seminar - Alexander Zyuzin

Condensed Matter Physics Seminar - Alexander Zyuzin

Science and Information Technology

This is part of a virtual seminar series in theoretical condensed matter and atomic physics, with the aim to connect researchers working at different Nordic universities. This seminar by Alexander Zyuzin from Aalto University is titled "Preformed Cooper pairs in flat-band semimetals".

Seminar
Date
28 Mar 2022
Time
13:15 - 14:15
Location
Digitally via Zoom
Additional info
Zoom-link to the
seminar

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.

The seminar is held digitally via Zoom

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

Read more about the seminar series

Condensed Matter Physics Seminar

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