Seminars Digest, Vol 49, Issue 5

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Today's Topics:

1. Friday 23.12.2022 (Serge Krashakov)

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Message: 1
Date: Wed, 21 Dec 2022 22:47:40 +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 23.12.2022
Message-ID: <a9eb692f-460b-b544-5188-c6e2d8b10f70@itp.ac.ru>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Уважаемые коллеги!

На заседании Ученого совета в пятницу  23 декабря в 11:30 будут
заслушаны 3 доклада:

1) _П.А. Носов_, И.С. Бурмистров, S. Raghu
*Взаимное влияние сверхпроводимости и локализации около двумерной
ферромагнитной квантовой критической точки* (длинный доклад)

Исследована сверхпроводящая неустойчивость двумерной неупорядоченной
ферми-жидкости, слабо связанной с мягкими флуктуациями, вызванными
близостью к ферромагнитной квантовой критической точке изинговского
типа. Получены квантовые поправки, вызванные взаимодействием, к
уравнению Узаделя, определяющему сверхпроводящею щель в системе.
Показано, что эффекты диффузии и локализации резко изменяют соотношение
между некогерентностными эффектами и притяжением. Построена фазовая
диаграмма системы и показано, что: (i) существует промежуточный диапазон
силы беспорядка, в котором сверхпроводимость усиливается, а при
дальнейшем росте беспорядка происходит переход сверхпроводник-изолятор;
и (ii) купероны приобретают аномальный динамический скейлинг с z=4, что
указывает на сильное неферми-жидкостное поведение.

2) Б.Г. Захаров
*Первый сигнал охлаждения струй в pp соударениях* (короткий доклад)

We discuss jet quenching in mini quark-gluon plasma produced in $pp$
collisions. We study the modification factor $I_{pp}$, describing the
medium modification of the jet fragmentation functions. We calculate
$I_{pp}$ within the light-cone path integral approach to induced gluon
emission for parametrization of the running coupling $\alpha_s(Q,T)$
which has a plateau around $Q=\kappa T$, motivated by the lattice
calculations of the effective QCD coupling in the quark-gluon plasma. We
calculate $I_{pp}$ with no free parameters using $\kappa$ fitted to the
LHC data on the nuclear modification factor $R_{AA}$. We find that the
predicted decrease with multiplicity of $I_{pp}$ for $5.02$ TeV $pp$
collisions agrees reasonably with the recent preliminary data from
ALICE. Our results show that the drop of $I_{pp}$ with the multiplicity,
if confirmed by further measurements, may be viewed as the first direct
evidence for jet quenching in $pp$ collisions.

3) М.А. Скворцов
*Ток захвата и теплообмен между сверхпроводящим нанопроводом и
диэлектрической подложкой* (короткий доклад)

Характеристики сверхпроводящих детекторов одиночных фотонов в
значительной степени определяются скоростью обмена энергии между
электронной подсистемой и фононами в диэлектрической подложке. В работе
проведено систематическое экспериментальное исследование теплового
кондактанса границы между сверхпроводящим проводом из NbN и шестью
типами диэлектрических подложкек. Тепловые свойства границы определены
путем анализа температурной зависимости тока захвата в рамках простой
модели резистивного состояния. Измеренные величины теплового кондактанса
границы в целом хорошо описываются моделью теплопереноса между двумя
черными телами с разными температурами: в проводе и в подложке.

ID и пароль онлайн-трансляций 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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Russian space debris cancels US spacewalk

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Hole spotted in leaky Russian Soyuz spacecraft

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