SPIN-CHARGE SEPARATION IN A MODEL OF 2 COUPLED CHAINS

被引：38

作者：

FABRIZIO, M ^{[1
]}

PAROLA, A ^{[1
]}

机构：

[1] UNIV MILAN,DIPARTIMENTO FIS,I-20122 MILAN,ITALY

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.70.226

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A model of interacting electrons living on two chains coupled by a transverse hopping t(perpendicular-to) is solved exactly by a bosonization technique. It is shown that t(perpendicular-to) does modify the shape of the Fermi surface also in the presence of interaction, although charge and spin excitations keep different velocities u(rho), u(sigma). Two different regimes occur: At short distances, x << xi = (u(rho) - u(sigma))/4t(perpendicular-to), the two chain model is not sensitive to t(perpendicular-to), while for larger separation x >> xi interchain hopping is relevant and generates further singularities in the electron Green function besides those due to spin-charge decoupling.

引用

页码：226 / 229

页数：4

共 14 条

[1] SINGULAR FORWARD SCATTERING IN THE 2D HUBBARD-MODEL AND A RENORMALIZED BETHE ANSATZ GROUND-STATE [J].