Doping of a spin-1 chain: integrable model

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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RevTeX, 6 pages, 3 figures; final version, to appear in PRL

Scientific paper

10.1103/PhysRevLett.81.2116

An exactly soluble model describing a spin S=1 antiferromagnetic chain doped with mobile S=1/2 carriers is constructed. In its continuum limit the undoped state is described by three gapless Majorana fermions composing the SU(2) triplet. Doping adds to this a scalar charge field and a singlet Majorana fermion with different velocity. We argue that this mode survives when the Haldane gap is added.

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