Abstract
The Green's function G(k,) is calculated for a hole in a Hubbard antiferromagnet by a new nonperturbative, variational method for an infinite square lattice. The quasiparticle and excited-state wave functions show that the substantial structure in the incoherent spectrum is related to string states for large U. The strength of the quasiparticle pole and the anisotropic effective mass are obtained as a function of (U/t). The quasiparticle lifetime is infinite for most k.
| Original language | English |
|---|---|
| Pages (from-to) | 892-895 |
| Number of pages | 4 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 41 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 1990 |
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