1992/10/19 by M. Fabrizio, Michele Fabrizio, Alberto Parola +1 · 3 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Spectroscopy and Quantum Chemical Studies #cond-mat
paper · pdf · doi:10.1103/physrevlett.70.226
12 pages, LATEX(REVTEX), SISSA 150/92/CM/MB
arxiv created 1992/10/19 · openalex publication_date 1993/01/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A model of interacting electrons living on two chains coupled by a transverse hopping t_\mathrm\ensuremath⊥ is solved exactly by a bosonization technique. It is shown that t_\mathrm\ensuremath⊥ does modify the shape of the Fermi surface also in the presence of interaction, although charge and spin excitations keep different velocities u_\mathrm\ensuremathρ, u_\mathrm\ensuremathσ. Two different regimes occur: At short distances, x\ensuremath≪\ensuremathξ=(u_\mathrm\ensuremathρ-u_\mathrm\ensuremathσ)/4t_\mathrm\ensuremath⊥, the two chain model is not sensitive to t_\mathrm\ensuremath⊥, while for larger separation x\ensuremath≫\ensuremathξ interchain hopping is relevant and generates further singularities in the electron Green function besides those due to spin-charge decoupling.