Spin-Charge separation in a model of two coupled chains

Details Spin-Charge separation in a model of two coupled chains Spin-Charge separation in a model of two coupled chains

1992-10-19

arxiv.org/abs/cond-mat/9210016v1

Physics

Condensed Matter

12 pages, LATEX(REVTEX), SISSA 150/92/CM/MB

Scientific paper

10.1103/PhysRevLett.70.226

A model of interacting electrons living on two chains coupled by a transverse hopping $t_\perp$, is solved exactly by bosonization technique. It is shown that $t_\perp$ does modify the shape of the Fermi surface also in presence of interaction, although charge and spin excitations keep different velocities $u_\rho$, $u_\sigma$. Two different regimes occur: at short distances, $x\ll \xi = (u_\rho - u_\sigma)/4t_\perp$, the two chain model is not sensitive to $t_\perp$, while for larger separation $x\gg \xi$ inter--chain hopping is relevant and generates further singularities in the electron Green function besides those due to spin-charge decoupling. (2 figures not included. Figure requests: FABRIZIO@ITSSISSA)

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