Fig. 1 Bands and hybridization in graphene-encapsulated WSe2 measured by μ-ARPES. Bands and hybridization in graphene-encapsulated WSe2 measured by μ-ARPES.

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Fig. 1 Bands and hybridization in graphene-encapsulated WSe2 measured by μ-ARPES. Bands and hybridization in graphene-encapsulated WSe2 measured by μ-ARPES. (A) Optical image and (B) schematic cross section of an exfoliated WSe2 flake with monolayer (1L), bilayer (2L), and bulk regions partially capped with monolayer graphene (G) and supported by a graphite flake on a doped silicon substrate. (C) Angle-integrated spectra from each region in (A). (D) Map of the energy of peak emission, showing contrast between 1L, 2L, and bulk regions. (E) Momentum slice through the graphene K point, showing that EF is at the Dirac point. (F) Momentum slice along Γ − K (WSe2) in the 1L region. The intensity is twice-differentiated with respect to energy. Avoided crossings between the graphene valence band (white dotted line) and the monolayer WSe2 bands are indicated by white arrows. (G) Momentum slice of unprocessed (top) and twice-differentiated ARPES (bottom) along Γ − K (WSe2) in the 1L (left), 2L (middle), and bulk (right) regions. Below is the intensity twice-differentiated with respect to energy with overlaid DFT calculation (red dashed lines). Neil R. Wilson et al. Sci Adv 2017;3:e1601832 Copyright © 2017, The Authors