Doping of a spin-1 chain: integrable model

Details Doping of a spin-1 chain: integrable model Doping of a spin-1 chain: integrable model

1998-03-12

arxiv.org/abs/cond-mat/9803145v3

Phys. Rev. Lett. 81, 2116 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

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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