Statistical Mechanics of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>X</mi><mi></mi><mi>Y</mi></math></span> Model. II. Spin-Correlation Functions

Eytan Barouch; Barry M. McCoy

doi:10.1103/PhysRevA.3.786

Statistical Mechanics of the $X Y$ Model. II. Spin-Correlation Functions

Eytan Barouch and Barry M. McCoy

Phys. Rev. A 3, 786 – Published 1 February 1971

Abstract

The spin-correlation functions of the one-dimensional $X Y$ model are studied in the presence of a constant magnetic field. We find that the asymptotic behavior of these correlation functions depends strongly on the various parameters of the Hamiltonian.