Motion of a single hole is studied at finite temperatures in the t-J model on a slave-fermion Schwinger-boson representation. The spin fluctuation is treated with the mean-field theory of Arovas and Auerbach. The Green's function for the slave fermion is calculated within the self-consistent Born approximation. A sharp quasiparticle peak is found to be separated from a broad spectrum of incoherence in the spectral function for low temperatures. The Green's function for the physical hole is calculated by taking account of the multiple scattering between the slave fermion and the Schwinger boson. A bound state of the slave fermion and the Schwinger boson is found at low temperatures, suggesting that the spin and the charge cannot be separated into a simple form. The energy of the bound state is minimized at momenta (\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2, \ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2), indicating that a small pocketlike Fermi surface is formed around the momenta for low concentrations of dopant holes.Motion of a single hole is studied at finite temperatures in the t-J model on a slave-fermion Schwinger-boson representation. The spin fluctuation is treated with the mean-field theory of Arovas and Auerbach. The Green's function for the slave fermion is calculated within the self-consistent Born approximation. A sharp quasiparticle peak is found to be separated from a broad spectrum of incoherence in the spectral function for low temperatures. The Green's function for the physical hole is calculated by taking account of the multiple scattering between the slave fermion and the Schwinger boson. A bound state of the slave fermion and the Schwinger boson is found at low temperatures, suggesting that the spin and the charge cannot be separated into a simple form. The energy of the bound state is minimized at momenta (\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2, \ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2), indicating that a small pocketlike Fermi surface is formed around the momenta for low concentrations of dopant holes.

Physical review. B, Condensed matterJul 1, 199315 citations

Self-consistent solution to the nuclear many-body problem at finite temperature

T. Frick, H. Müther

The properties of symmetric nuclear matter are investigated within Green's functions approach. We have implemented an iterative procedure allowing for a self-consistent evaluation of the single-particle and two-particle propagators. The in-medium scattering equation is solved for a realistic (nonseparable) nucleon-nucleon interaction including both particle-particle and hole-hole propagation. The corresponding two-particle propagator is constructed explicitly from the single-particle spectral functions. Results are obtained for finite temperatures and an extrapolation to $T=0$ is presented.The properties of symmetric nuclear matter are investigated within Green's functions approach. We have implemented an iterative procedure allowing for a self-consistent evaluation of the single-particle and two-particle propagators. The in-medium scattering equation is solved for a realistic (nonseparable) nucleon-nucleon interaction including both particle-particle and hole-hole propagation. The corresponding two-particle propagator is constructed explicitly from the single-particle spectral functions. Results are obtained for finite temperatures and an extrapolation to $T=0$ is presented.

arXiv:nucl-th/0306009Physical Review CSep 16, 200389 citations

On the hole spectral function of the Emery model

K. W. Becker, W. Brenig, Peter Fulde

The European Physical Journal BJun 1, 199028 citations

T=0

is presented.