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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 67: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)

CPP 67.2: 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.