Effective field theory for the SO(n) bilinear-biquadratic spin chain

Details Effective field theory for the SO(n) bilinear-biquadratic spin chain Effective field theory for the SO(n) bilinear-biquadratic spin chain

2011-04-04

arxiv.org/abs/1104.0494v3

Phys. Rev. Lett. 107, 077204 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure, published version

Scientific paper

10.1103/PhysRevLett.107.077204

We present a low-energy effective field theory to describe the SO(n) bilinear-biquadratic spin chain. We start with n=6 and construct the effective theory by using six Majorana fermions. After determining various correlation functions we characterize the phases and establish the relation between the effective theories for SO(6) and SO(5). Together with the known results for n=3 and 4, a reduction mechanism is proposed to understand the ground state for arbitrary SO(n). Also, we provide a generalization of the Lieb-Schultz-Mattis theorem for SO(n). The implications of our results for entanglement and correlation functions are discussed.

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