Exact diagonalization of the S=1/2 Heisenberg chain
(using semi-momentum states and spin-inversion symmetry)

This program

 Source code for diagonalization hchain_mkpz.f90 dsyev.f (LAPAC diagonalization routine; real symmetric matrix)

 Source code for expectation values hchain_temp.f90

 Running instructions and example results Diagonalization instructions and results Thermodynamics instructions and results