Variational and DMRG studies of the Frustrated Antiferromagnetic Heisenberg S=1 Quantum Spin Chain

A. Kolezhuk, R. Roth, U. Schollwoeck

We study a frustrated antiferromagnetic isotropic Heisenberg $S=1$ chain using a variational ansatz and the DMRG. At ${\alpha }_D=0.284(1)$, there is a disorder point of the second kind, m…