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The bulk electronic structure of NiS$_{2-x}$Se$_x$ is studied across thebandwidth-control Mott transition (BCMT) by soft X-ray angle-resolvedphotoemission spectroscopy. The microscopic picture of the BCMT in thismultiband non-half-filled system is revealed for the first time. We show thatSe doping does not alter the Fermi surface volume. When approaching theinsulating phase with decreasing Se concentration, we observed that the Fermivelocity continuously decreases. Meanwhile, the coherent quasiparticle weightcontinuously decreases and is transferred to higher binding energies, until itsuddenly disappears across the Mott transition. In the insulating phase, thereis still finite spectral weight at the Fermi energy, but it is incoherent anddispersionless due to strong correlations. Our results provide a directobservation of BCMT, and unveil its distinct characters in a multibandnon-half-filled system.

Direct observation of the bandwidth control Mott transition in the NiS$_{2-x}$Se$_x$ multiband system