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O: Fachverband Oberflächenphysik
O 66: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)
O 66.2: Vortrag
Mittwoch, 18. März 2020, 10:45–11:00, WIL B321
Probing the electronic structure of twisted transition metal dichalcogenide bilayers by photoemission — •bharti parashar1, sven borghardt2, kevin janssen1, mateo jugovac1, vitaliy feyer1, dorota wilgocka slezak3, józef korecki3, lukasz plucinski1, and claus m. schneider1 — 1PGI-6, FZ Jülich, Germany — 2PGI-9, FZ Jülich, Germany — 3Polish Academy of Sciences, Kraków, Poland
Moire bands in twisted transition metal dichalcogenide (TMDC) bilayers are predicted to host novel topological and correlated electronic phases [1]. We performed angle-resolved photoemission studies with few micrometer resolution (µ-ARPES) on several hetero- and homo-bilayers made from MoS2 and WSe2 by mechanical exfoliation and dry transfer technique. The twist angle between the layers was determined in a separate experiment by µ-LEED.
We determine the hybridization between the layers through monitoring the formation of new spectral features in normal emission spectra, that are not present in respected monolayers. The existence of hybridization indicates high quality of the interface that is critical to enable formation of interesting moire bands. Furthermore, our results allow to shed light on whether the valence band maximum is located at Γ or at K at various bilayers. This is improtant for predicted moire physics, since only at K the bands are spin-momentum locked.
[1] See e.g.: F. Wu, T. Lovorn, E. Tutuc, I. Martin, and A. H. MacDonald, Phys. Rev. Lett. 122, 086402 (2019), and refs. therein.