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The currently established electronic phase diagram of cuprates is based on astudy of single- and double-layered compounds. These CuO$_2$ planes, however,are directly contacted with dopant layers, thus inevitably disordered with aninhomogeneous electronic state. Here, we solve this issue by investigating a6-layered Ba$_2$Ca$_5$Cu$_6$O$_{12}$(F,O)$_2$ with inner CuO$_2$ layers, whichare clean with the extremely low disorder, by angle-resolved photoemissionspectroscopy (ARPES) and quantum oscillation measurements. We find a tiny Fermipocket with a doping level less than 1% to exhibit well-defined quasiparticlepeaks which surprisingly lack the polaronic feature. This provides the firstevidence that the slightest amount of carriers is enough to turn a Mottinsulating state into a metallic state with long-lived quasiparticles. Bytuning hole carriers, we also find an unexpected phase transition from thesuperconducting to metallic states at 4%. Our results are distinct from thenodal liquid state with polaronic features proposed as an anomaly of theheavily underdoped cuprates.

Unveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed