Validity of the rigid band picture for the t-J model

Details Validity of the rigid band picture for the t-J model Validity of the rigid band picture for the t-J model

1994-06-15

arxiv.org/abs/cond-mat/9406064v1

Physics

Condensed Matter

Remarks: Revtex file + 7 figures attached as compressed postscript files Figures can also be obtained by ordinary mail on requ

Scientific paper

10.1103/PhysRevB.50.3350

We present an exact diagonalization study of the doping dependence of the single particle Green's function in 16, 18 and 20 site clusters of t-J model. We find evidence for rigid-band behaviour starting from the half-filled case: upon doping, the topmost states of the quasiparticle band observed in the photoemisson spectrum at half-filling cross the chemical potential and reappear as the lowermost states of the inverse photoemission spectrum. Features in the inverse photoemission spectra which are inconsistent with rigid-band behaviour are shown to originate from the nontrivial point group symmetry of the ground state with two holes, which enforces different selection rules than at half-filling. Deviations from rigid band behaviour which lead to the formation of the `large Fermi surface' in the momentum distribution occur only at energies far from the chemical potential. A Luttinger Fermi surface and a nearest neighbor hopping band do not exist.

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