Abstract

A partial charge–spin separation fermion-spin theory is developed to study thenormal-state properties of the underdoped cuprates. In this approach, the physical electronis decoupled as a gauge invariant dressed holon and spinon, with the dressed holonbehaving like a spinful fermion, representing the charge degree of freedom together with thephase part of the spin degree of freedom, while the dressed spinon is a hard-core boson,representing the amplitude part of the spin degree of freedom. The local electronconstraint for single occupancy is satisfied. Within this approach, the charge and spindynamics of the underdoped cuprates are studied based on the model. It is shown that the charge dynamics is mainly governed by the scattering fromthe dressed holons due to the dressed spinon fluctuation, while the scattering from thedressed spinons due to the dressed holon fluctuation dominates the spin dynamics.

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