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SUMMARY:Topological surface superconductivity in PtBi2
DTSTART:20260707T120000Z
DTEND:20260707T130000Z
DTSTAMP:20260717T000600Z
UID:indico-event-19040@indico.psi.ch
CONTACT:markus.mueller@psi.ch
DESCRIPTION:Speakers: Jeroen van den Brink (Dresden)\n\nMost superconducti
 ng materials are well understood and conventional—that is\, the pairs of
  electrons that cause the superconductivity by their condensation have the
  highest possible symmetry. Famous exceptions are the enigmatic high-tempe
 rature (high-Tc) cuprate superconductors. Nodes in their superconducting g
 ap are the fingerprint of their unconventional character and imply superco
 nducting pairing of d-wave symmetry. Here\, by using angle-resolved photoe
 mission spectroscopy\, we observe that the Weyl semimetal PtBi2 [1\,2] ha
 rbours nodes in its superconducting gap\, implying unconventional i-wave p
 airing symmetry. At temperatures below 10 K\, the superconductivity in P
 tBi2 gaps out its topological surface states\, the Fermi arcs\, whereas i
 ts bulk states remain normal [3]. The nodes in the superconducting gap tha
 t we observe are located exactly at the centre of the Fermi arcs and imply
  the presence of topologically protected Majorana cones around this locus 
 in momentum space [4]. From this\, we infer theoretically that robust zero
 -energy Majorana flat bands emerge at surface step edges. This establishes
  PtBi2 surfaces not only as unconventional\, topological i-wave supercond
 uctors but also as a promising material platform in the ongoing effort to 
 generate and manipulate Majorana bound states.\n \nReferences \n \n1. 
   Vocaturo\, Koepernik\, Facio\, Timm\, Fulga\, Janson\, van den Brink\,
  Phys. Rev. B 110\, 054504 (2024).\n2.   Veyrat\, Labracherie\, Bashlak
 ov\, Caglieris\, Facio\, Shipunov\, Charvin\, Acharya\, Naidyuk\, Giraud\,
  van den Brink\, Buchner\, Hess\, Aswartham\, Dufouleur\, Nano Lett. 23\, 
 1229 (2023).\n3.   Kuibarov\, Suvorov\, Vocaturo\, Fedorov\, Lou\, Merk
 witz\, Voroshnin\, Facio\, Koepernik\, Yaresko\, Shipunov\, Aswartham\, va
 n den Brink\, Buchner\, Borisenko\, Nature 626\, 294 (2024).\n4.   Chan
 gdar\, Suvorov\, Kuibarov\, Thirupathaiah\, Shipunov\, Aswartham\, Wurmehl
 \, Kovalchuk\, Koepernik\, Timm\, Büchner\, Fulga\, Borisenko\, van den B
 rink\, Nature 647\, 613 (2025) \n\nhttps://indico.psi.ch/event/19040/
LOCATION:WHGA/121
URL:https://indico.psi.ch/event/19040/
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