Fig. 3: Out-of-plane dispersion of the spectral function of the highest occupied band.
From: Momentum-resolved fingerprint of Mottness in layer-dimerized Nb3Br8
a ARPES spectrum at normal emission measured with linear horizontal polarization as a function of out-of-plane momentum kz, converted from photon energy dependence via the free electron final state approximation with inner potential V0 = 12 eV. b EDCs at the band top and bottom showing the bandwidth of the kz dispersion. c, d show ARPES simulations of the effective 1D dimerized system in the Mott insulating phase, and in the band insulating phase, respectively. The corresponding intensity profiles I(k,E) along kz are shown in (g) and (h), which we use to compare with the MDCs of (a), integrated over the red and blue energy windows, displayed in (e). f The interlayer spacing d corresponds to the average distance between the planes of Nb atoms.
