Research output: Contribution to journal › Journal article
|Journal publication date||07/2009|
|Journal||Journal of statistical mechanics-Theory and experiment|
|Number of pages||10|
We calculate a correlation function of the Jordan-Wigner operator in a class of free-fermion models formulated on an infinite one-dimensional lattice. We represent this function in terms of the determinant of an integrable Fredholm operator, convenient for analytic and numerical investigations. By using Wick's theorem, we avoid the form-factor summation customarily used in the literature for treating similar problems.