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Starting from the effective low energy theory of a doped Mott insulator, weshow that the effective carrier density in the underdoped regime agrees with atwo - fluid description. Namely, it has distinct temperature independent andthermally activated components. We identify the thermally activated componentas the bound state of a hole and a charge 2e boson, which occurs naturally inthe effective theory. The thermally activated unbinding of this state leads tothe strange metal and subsequent $T-$linear resistivity. We find that thedoping dependence of the binding energy is in excellent agreement with theexperimentally determined pseudogap energy scale in cuprate superconductors.

Charge 2e Boson Underlies Two - Fluid Model of the Pseudogap in Cuprate Superconductors