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We examine spectral properties of doped holes dressed with surrounding spincloud in the t-J model. These composite-hole excitations well characterizeprominent band structures in the angle-resolved photoemission spectrum. Inone-dimensional (1D) case at half-filling, we identify the composite operatorsthat separately pick up the spinon and holon branches, respectively. After holedoping, we find that the composite hole excitations with string-like spins tendto be localized at k=\pi/2 in the momentum space. This means that suchcomposite excitations should be actual electronic excitations, since the spinonand holon branches merge together at this momentum. In 2D case, we find thatthe composite excitations with more non-local spin fluctuation have strongerintensity near the Fermi level. The composite band structure along diagonal(0,0)-(\pi,\pi) direction in 2D has some similarity to that in 1D, and suchnon-local spin fluctuation plays an important role on the formation of thepseudogap in high-Tc cuprates.

Exact-Diagonalization Analysis of Composite Excitations in the t-J Model