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.
1992
45
22
13156
13159
https://doi.org/10.1103/PhysRevB.45.13156
Parola, A; Sorella, S
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/13586
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