Journal Article

FZJ-2023-02729

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Photoemission study of twisted monolayers and bilayers of WSe 2 on graphite substrates

Parashar, B. ; Rathmann, L. ; Kim, H.-J.FZJ* ; Cojocariu, I.FZJ* ; Bostwick, A. ; Jozwiak, C. ; Rotenberg, E. ; Avila, J. ; Dudin, P. ; Feyer, V.FZJ* ; Stampfer, C.FZJ* ; Beschoten, B.FZJ* ; Bihlmayer, G.FZJ* ; Schneider, C. M.FZJ* ; Plucinski, L. (Corresponding author)FZJ*

2023
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevMaterials.7.044004  doi:10.34734/FZJ-2023-02729

Abstract: Using microfocused angle-resolved photoemission spectroscopy we investigated microstructures containing regions of single-layer (SL) and bilayer (BL) WSe2 on graphite substrates at different twist angles between SL WSe2 and graphite and within the BL WSe2. Fermi level electrons emitted from the graphite are sharply focused near their Kgr points in the Brillouin zone, and, when passing through the WSe2, get diffracted to form band replicas readily observed in experimental Fermi surface maps from twisted SL WSe2/graphite. We investigated two twisted BL WSe2 at twist angles ∼28∘ and ∼10∘ and found no evidence of hybridization gaps at the interlayer band-crossing points, that could be precursors of the flat bands at smaller twist angles. Similarly, no such gaps were found for SL WSe2/graphite. Experimental results are complemented by theoretical density functional theory calculations, which suggest that a formation of hybridization gaps in the WSe2/graphene (which approximates the experimental WSe2/graphite system) sensitively depends on the WSe2 band character at the crossing point with the graphene Dirac band.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)
2. Quanten-Theorie der Materialien (IAS-1)
3. Elektronische Eigenschaften (PGI-6)
4. JARA Institut Quanteninformation (PGI-11)
5. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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