Fig. 1: Hexapetalus flower-shaped bands in bulk 2H-α-In2Se3.
From: Probing and manipulating the Mexican hat-shaped valence band of In2Se3
a Side and in-plane view of a single van der Waal layer (α-In2Se3) and the full and projected Brillouin zone (BZ) for bulk 2H-α-In2Se3. b Constant energy ARPES slices taken near the valence band maximum, VBM (photon energy 21.219 eV). c Constant energy ARPES slices taken near the VBM with high k-resolution. d Colour plot of the electron energy (in eV) versus in-plane k-vector, as determined by ARPES (top) and DFT (bottom). The DFT plots correspond to different out-of-plane wave vectors kz (at the centre, Γ, and at the edge, A, of the BZ). The projected in-plane hexagonal BZ is overlaid on the plots. e Colour plot of the electron energy (in eV) versus in-plane k-vector, as determined by ARPES (top) and DFT at Γ (bottom). Experimental data in (e) were acquired with greater k-resolution and over a narrower energy range than in part (d). Energies (in eV) are referenced to the Fermi level for ARPES and to the VBM for DFT.
