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EnglishAn exact expression for the Green's function G(k,omega) of one hole in the U --> infinity one-dimensional Hubbard model is derived from the known Bethe-ansatz solution of the model. Due to the spin-charge decoupling of the one-hole excitation spectrum and the Fermi-like statistics of the spin excitations, G shows branch-cut singularities at omega=+/-2 sink and a nontrivial dependence on the momentum of the hole. As a result, the hole can propagate although the quasiparticle weight vanishes.
http://hdl.handle.net/11383/6405| Titolo: | SPIN-CHARGE DECOUPLING AND THE GREENS-FUNCTION OF ONE-DIMENSIONAL MOTT INSULATORS |
| Autori interni: | PAROLA, ALBERTO |
| Data di pubblicazione: | 1992 |
| Rivista: | PHYSICAL REVIEW. B, CONDENSED MATTER |
| Abstract: | An exact expression for the Green's function G(k,omega) of one hole in the U --> infinity one-dimensional Hubbard model is derived from the known Bethe-ansatz solution of the model. Due to the spin-charge decoupling of the one-hole excitation spectrum and the Fermi-like statistics of the spin excitations, G shows branch-cut singularities at omega=+/-2 sink and a nontrivial dependence on the momentum of the hole. As a result, the hole can propagate although the quasiparticle weight vanishes. |
| Handle: | http://hdl.handle.net/11383/6405 |
| Appare nelle tipologie: | Articolo su Rivista |
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