A new correlator in quantum spin chains

Details A new correlator in quantum spin chains A new correlator in quantum spin chains

2006-04-06

arxiv.org/abs/cond-mat/0604173v1

J. Phys. A 39, L389 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 1 figure

Scientific paper

10.1088/0305-4470/39/24/L01

We propose a new correlator in one-dimensional quantum spin chains, the $s-$Emptiness Formation Probability ($s-$EFP). This is a natural generalization of the Emptiness Formation Probability (EFP), which is the probability that the first $n$ spins of the chain are all aligned downwards. In the $s-$EFP we let the spins in question be separated by $s$ sites. The usual EFP corresponds to the special case when $s=1$, and taking $s>1$ allows us to quantify non-local correlations. We express the $s-$EFP for the anisotropic XY model in a transverse magnetic field, a system with both critical and non-critical regimes, in terms of a Toeplitz determinant. For the isotropic XY model we find that the magnetic field induces an interesting length scale.

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