Exact full counting statistics for the staggered magnetization and the domain walls in the XY spin chain
arXiv:2012.14012 · doi:10.1103/PhysRevE.103.042107
Abstract
We calculate exactly cumulant generating functions (full counting statistics) for the transverse, staggered magnetization and the domain walls at zero temperature for a finite interval of the XY spin chain. In particular, we also derive a universal interpolation formula in the scaling limit for the full counting statistics of the transverse magnetization and the domain walls which is based on the solution of a Painlevé V equation. By further determining subleading corrections in a large interval asymptotics, we are able to test the applicability of conformal field theory predictions at criticality. As a byproduct, we also obtain exact results for the probability of formation of ferromagnetic and antiferromagnetic domains in both and basis in the ground state. The analysis hinges upon asymptotic expansions of block Toeplitz determinants, for which we formulate and check numerically a new conjecture.
arXiv comment19 pages, 7 figures. Additional details in the Appendices, references added, typos corrected. Final version published in Phys. Rev. E
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