Flux period, spin gap, and pairing in the one-dimensional t-J-J'-model

Details Flux period, spin gap, and pairing in the one-dimensional t-J-J'-model Flux period, spin gap, and pairing in the one-dimensional t-J-J'-model

2003-12-04

arxiv.org/abs/cond-mat/0312106v2

Phys. Rev. Lett. 93, 046401 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Published version, 4 pages, 2 figures, RevTex4

Scientific paper

10.1103/PhysRevLett.93.046401

Using the factorization of the wavefunction in the t-J-J'-model at small exchange couplings, we demonstrate the connection between the existence of a spin gap and an hc/2e flux periodicity of the ground state energy. We conjecture that all spin-gapped SU(2)-invariant Luttinger liquids have hc/2e flux periodicity, and that this is connected to the fact that a gapped spin-1/2 chain always breaks translational symmetry by doubling the unit cell.

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