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[Fizinfo] Szilárd-kollokvium (kedd 14:30), Yankowitz a grafén szupravezetésről

From: Dr. Dóra Balázs <dora.balazs AT ttk.bme.hu>
To: "fizinfo AT lists.kfki.hu" <fizinfo AT lists.kfki.hu>
Subject: [Fizinfo] Szilárd-kollokvium (kedd 14:30), Yankowitz a grafén szupravezetésről
Date: Thu, 22 Oct 2026 10:39:02 +0000
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MEGHÍVÓ

a Szilárd Leó-Kollokvium előadására:

Matthew Yankowitz

(University of Washington)

“Flickering and failed superconductivity in rhombohedral graphene"

Kivonat: When a superconductor is cooled below its critical temperature, its
resistance ordinarily falls to zero and stays there. I will present transport
experiments on ultra-clean rhombohedral graphene that break this expectation
in two ways. In parts of its gate-tuned superconducting phase diagram, we
find that the resistance ‘flickers’ randomly in time between zero and its
full normal-state value, with large regions of the sample switching together
and remaining in each state for minutes at a time. The switching reflects a
competition between two nearly degenerate electronic states, only one of
which is superconducting. In another region of gate space, superconductivity
instead appears to ‘fail’: the usual hallmarks of its onset are present, but
the resistance saturates at a finite value, the signature of the long-debated
anomalous metal. This state sits directly beside a zero-resistance
superconductor in the same device, allowing the two regimes to be compared by
gate tuning alone. I will discuss what these two behaviors reveal about
superconductivity in a system with competing magnetic phases.

Helye: BME Fizikai Intézet, Fizika Tanszék
Budafoki út 8. F-épület, 2. emelet, 13-as terem

Ideje: 2026. október 27. (kedd), 14:30.
Kapunyitás 14:14-től.
Program: https://physics.ttk.bme.hu/colloquium

Minden érdeklődőt örömmel várunk!

Dóra Balázs, a BME FI képviseletében

[Fizinfo] Szilárd-kollokvium (kedd 14:30), Yankowitz a grafén szupravezetésről, Dr . Dóra Balázs, 10/22/2026