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.
Spin-charge decoupling and the Greens function of one-dimensional Mott insulators / Parola, A; Sorella, S. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 45:22(1992), pp. 13156-13159. [10.1103/PhysRevB.45.13156]
Spin-charge decoupling and the Greens function of one-dimensional Mott insulators
SORELLA S
1992-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
