  We show that the triply degenerate Q valleys in few-layer transition metal
dichalcogenides provide a unique platform for exploring the rare flavor SU(3)
symmetry in quantum dot geometry. The single and double dots are reminiscent of
the quark model and eightfold way, and their many-body triplets and octets may
be regarded as artificial quarks and hadrons. For the artificial quark
transistor, each level hosts one central and two side Coulomb peaks of
irrational height ratios, and flavor Kondo effects occur at 1/3 and 2/3
fillings with fractional conductance quantization in the unitary limit.
