Exact and simple results for the XYZ and strongly interacting fermion chains

Details Exact and simple results for the XYZ and strongly interacting fermion chains Exact and simple results for the XYZ and strongly interacting fermion chains

2010-06-01

arxiv.org/abs/1006.0237v2

J. Phys. A 43 (2010) 402004

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

We conjecture exact and simple formulas for physical quantities in two quantum chains. A classic result of this type is Onsager, Kaufman and Yang's formula for the spontaneous magnetization in the Ising model, subsequently generalized to the chiral Potts models. We conjecture that analogous results occur in the XYZ chain when the couplings obey J_xJ_y + J_yJ_z + J_x J_z=0, and in a related fermion chain with strong interactions and supersymmetry. We find exact formulas for the magnetization and gap in the former, and the staggered density in the latter, by exploiting the fact that certain quantities are independent of finite-size effects.

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