[Landau ITP Seminars] Friday 23.09.2022

[Serge Krashakov]

Уважаемые коллеги!

На заседании Ученого совета в пятницу 23 сентября в 11:30 будет заслушан 
доклад:

_P.A. Nosov_, I.S. Burmistrov, S. Raghu
*Superconductivity and localization near a two-dimensional ferromagnetic 
quantum critical point*

We consider a two-dimensional disordered Fermi liquid weakly coupled to 
the soft fluctuations associated with proximity to an 
Ising-ferromagnetic quantum critical point. By performing a two-loop 
calculation of the effective action in the modified non-linear sigma 
model framework, we derive interaction-induced corrections to the Usadel 
equation governing the superconducting gap function. We analyze a 
linearized version of this equation and show that diffusion and 
localization effects drastically change the interplay between fermionic 
incoherence and strong pairing interactions. In particular, we 
demonstrate that: (i) diffusive particle-particle modes (so-called 
`Cooperons') acquire new dynamical scaling z=4; (ii) there is an 
intermediate range of disorder strength where superconductivity is 
enhanced, eventually followed by a tendency towards the 
superconductor-insulator transition at stronger disorder; (iii) 
dephasing of particle-particle excitations leads to an additional 
contribution to the thermal self-energy and increases pair-breaking effects


ID и пароль онлайн-трансляции в Zoom те же, что и для предыдущих 
трансляций докладов на Ученом совете:
https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09
Meeting ID: 968 9936 4518
Пароль: 250319
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