Answers are grounded in this paper and cite their sources.
The authors show that the existence of zeros of the energy gap for finite quantum chains is related to a non-vanishing wavevector. Finite-scaling ansatze are formulated for incommensurable and oscillatory structures. The ansatze are verified in the one-dimensional XY model in a transverse field.
No takes yet. Share an insight, caveat, or question.
Hoeger et al. (1985) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: