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Coupling together distinct correlated and topologically non-trivialelectronic phases of matter can potentially induce novel electronic orders andphase transitions among them. Transition metal dichalcogenide compounds serveas a bedrock for exploration of such hybrid systems. They host a variety ofexotic electronic phases and their Van der Waals nature enables to admix them,either by exfoliation and stacking or by stoichiometric growth, and therebyinduce novel correlated complexes. Here we investigate the compound 4Hb-TaS$_2$that interleaves the Mott-insulating state of 1T-TaS$_2$ and the putative spinliquid it hosts together with the metallic state of 2H-TaS$_2$ and the lowtemperature superconducting phase it harbors. We reveal a thermodynamic phasediagram that hosts a first order quantum phase transition between a correlatedKondo cluster state and a flat band state in which the Kondo cluster becomesdepleted. We demonstrate that this intrinsic transition can be induced by anelectric field and temperature as well as by manipulation of the interlayercoupling with the probe tip, hence allowing to reversibly toggle between theKondo cluster and the flat band states. The phase transition is manifested by adiscontinuous change of the complete electronic spectrum accompanied byhysteresis and low frequency noise. We find that the shape of the transitionline in the phase diagram is determined by the local compressibility and theentropy of the two electronic states. Our findings set such heterogeneousstructures as an exciting platform for systematic investigation andmanipulation of Mott-metal transitions and strongly correlated phases andquantum phase transitions therein.

First Order Quantum Phase Transition in the Hybrid Metal-Mott Insulator Transition Metal Dichalcogenide 4Hb-TaS2