Electrons in the t-J model as bound states of spinons and holons.

We identify the quasielectron band in the t-J model at small hole doping using a gauge-theoretic approach. We find that quasielectrons are formed as bound states of spinons and holons. At zero doping, the residue of the bound state vanishes at the Fermi momentum of the spinons. At this point, the inelastic spectrum develops a fractional-power singularity that is reminiscent of an x-ray singularity. The spectral weight of the Green's function of the bound state adds up to the spinon density as required by the Hubbard algebra. We also derive an effective field theory for many quasielectrons and their interactions