Seminars Digest, Vol 46, Issue 4

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Today's Topics:

1. Friday 23.09.2022 (Serge Krashakov)

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Message: 1
Date: Tue, 20 Sep 2022 20:33:48 +0300
From: Serge Krashakov <sakr@itp.ac.ru>
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Friday 23.09.2022
Message-ID: <f8533ee2-5d2d-42ec-7348-9142bb0b1b89@itp.ac.ru>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

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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