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UID:DSC-23154
DTSTART;TZID=Europe/Berlin:20261007T130000
SEQUENCE:1790314770
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20261007T140000
URL:https://dresden-science-calendar.org/calendar/en/detail/23154
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Laxman: Electronic structure at 2D–metal interfaces: from ARPES t
 o superconducting junctions
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Nagireddy Laxman\nInstitute of Speaker: CNRS\, Tha
 les\, Université Paris-Saclay\nTopics:\n\n Location:\n  Name: IFW (D2E.27
 \, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  P
 hone: \n  Fax: \nDescription: Understanding the interface between metals a
 nd two-dimensional materials is critical for their application in electron
 ics\, and requires model systems in which the roughness\, purity and cryst
 allinity of the metal surface can be controlled. Template-stripped gold pr
 ovides such a platform\, and this talk uses it to show how a metal substra
 te reshapes the electronic structure of the layer above it. Here\, we use 
 angle-resolved photoemission spectroscopy to investigate the layer-depende
 nt electronic structure of WSe2 on template-stripped gold (TSG) substrates
  [1]\, fabricated using both silicon and mica templates to give disordered
  and Au(111)-ordered surfaces. Strong hybridisation around Γ points to a 
 covalent admixture in the gold-WSe2 interaction. In addition\, band shifts
  indicate charge rearrangement at the interface. Core-level spectroscopy r
 esolves a single chemical environment for the interfacial WSe2 layer\, dis
 tinct from the layers above. The interaction is best described as covalent
 -like quasi-bonding of intermediate strength. Building upon the same prepa
 ration route\, we study the electronic structure of the two-dimensional ma
 gnetic semiconductor CrSBr in both the bulk [2] and monolayer [3] limits. 
 In bulk\, the electronic structure can be followed from the antiferromagne
 tic ground state into the paramagnetic phase\, revealing pairs of states a
 t X whose splitting disappears above TN =132 K and is interpreted as an ef
 fective exchange splitting within individual layers. In the monolayer limi
 t the substrate plays a far more active role: charge transfer populates th
 e conduction band\, the quasiparticle gap is strongly reduced\, and the tw
 o conduction bands split at X\, signalling a breaking of the glide-mirror 
 symmetry that protects this degeneracy in the free-standing monolayer. TSG
  therefore does more than modify carrier density and screening: it can lif
 t symmetry-protected degeneracies and reshape the band topology itself. Th
 is concern with interface quality extends from spectroscopy to transport i
 n current work at CNRS–Thales\, on heterostructures combining high-Tc d-
 wave superconductors with 2D transition-metal dichalcogenides for studies 
 of the superconducting proximity effect [4].  References [1] L. Nagireddy 
 et al.\, 2D Mater. 12\, 045017 (2025). [2] M. D. Watson et al.\, npj 2D Ma
 ter. Appl. 8\, 54 (2024). [3] Y. P. Ghimirey et al.\, npj 2D Mater. Appl. 
 10\, 26 (2026). [4] D. Perconte et al.\, Nat. Phys. 14\, 25 (2018).
DTSTAMP:20260925T130134Z
CREATED:20260917T053638Z
LAST-MODIFIED:20260925T053930Z
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