Physics – Condensed Matter
Scientific paper
1994-06-02
Physics
Condensed Matter
12 pages, RevTeX, preprint CSIC
Scientific paper
10.1103/PhysRevLett.73.926
We examine and explain the Luttinger-liquid character of models solvable by the Bethe ansatz by introducing a suitable bosonic operator algebra. In the case of the Hubbard chain, this involves two bosonic algebras which apply to {\it all} values of $U$, electronic density, and magnetization. Only at zero magnetization does this lead to the usual charge - spin separation. We show that our ``pseudoparticle'' operator approach clarifies, unifies, and extends several recent results, including the existence of independent right and left equations of motion and the concept of ``pseudoparticle'' (also known as ``Bethe quasiparticle'').
Campbell David K.
Carmelo Jose. M. P.
Castro Neto Antonio H.
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