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[Fizinfo] BME Elm. Fiz. Szeminárium, ápr. 1., Zaránd Gergely

From: Janos Asboth <asboth.janos AT ttk.bme.hu>
To: fizinfo AT lists.kfki.hu, elmfiz.oktatok-kutatok AT lists.bme.hu, elmfiz.hallgatok AT lists.bme.hu
Subject: [Fizinfo] BME Elm. Fiz. Szeminárium, ápr. 1., Zaránd Gergely
Date: Thu, 31 Mar 2022 08:09:42 +0200
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Meghívó

BME Elméleti Fizika Szeminárium

ápr. 1. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba
és
online
<https://teams.microsoft.com/l/meetup-join/19%3ae1a26210676841cdbb27bb01cf353392%40thread.tacv2/1648468051493?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>
a Microsoft Teamsben,

Zaránd Gergely (BME Elm. Fiz. Tanszék):
Kondo Cloud in a Superconductor

Magnetic impurities embedded in a metal are screened by the Kondo effect,
signaled by the formation of an extended correlation cloud, the so-called
Kondo or screening cloud. In a superconductor, the Kondo state turns into
subgap Yu-Shiba-Rusinov states, and a quantum phase transition occurs
between screened and unscreened phases, once the superconducting energy gap
exceeds sufficiently the Kondo temperature. We show [1] that, although the
Kondo state does not form in the unscreened phase, the Kondo cloud does
exist in both quantum phases. However, while screening is complete in the
screened phase, it is only partial in the unscreened phase. Compensation, a
quantity introduced to characterize the integrity of the cloud, is
universal, and shown to be related to the magnetic impurities’ g factor,
monitored experimentally by bias spectroscopy.

[1]: CP Moca, I Weymann, MA Werner, and G Zaránd, Phys. Rev. Lett. 127,
186804 (2021).

Minden érdeklődőt szeretettel várunk,
Asbóth János
szemináriumi koordinátor

[Fizinfo] BME Elm. Fiz. Szeminárium, ápr. 1., Zaránd Gergely, Janos Asboth, 03/31/2022