Phys. Rev. Lett. 81, 2116–2119 (1998)Doping of a Spin-1 Chain: An Integrable ModelReceived 12 March 1998; published in the issue dated 7 September 1998 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 a scalar charge field and a singlet Majorana fermion with different velocity. We argue that this mode survives when the Haldane gap is added. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2116
DOI:
10.1103/PhysRevLett.81.2116
PACS:
71.10.Pm, 75.10.Jm, 75.50.Ee
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