We compute the large but finite-size corrections to the XYZ spin-(1/2) Heisenberg chain using a method recently proposed by de Vega and Woynarovich. We derive in closed form the corrections to the ground-state energy and the function σ(λ) (finite-size analog to the root density). Different asymptotic regimes are found when the number of sites goes to infinity depending on the two parameters of the Hamiltonian.

• Received 1 April 1985

DOI:https://doi.org/10.1103/PhysRevB.32.5959