  Through far-infrared studies of La2-xSrxCuO4 single crystals for x = 0.063,
0.07, 0.09, and 0.11, we found that only ~ 0.2 % of the total holes
participated in the nearly dissipationless normal state charge transport and
superconductivity. We have also observed characteristic collective modes at w ~
18 cm-1 and 22 cm-1 due to the bound carriers in an electronic lattice (EL)
state and the free carriers are massively screened by the EL. Our findings lead
us to propose a composite picture of the charge system where the free carriers
are coupled to and riding on the EL. This unique composite system of charge
carriers may provide further insights into the understanding of the cuprate
physics.
