Marshall-Peierls sign rule for excited states of the frustrated J1-J2 Heisenberg antiferromagnet
A. Voigt, J. Richter, N. B. Ivanov
Abstract
We present analytical and numerical calculations for some exited states of the frustrated J1-J2 spin-1/2 Heisenberg model for linear chains and square lattices. We consider the lowest eigenstates in the subspaces determined by the eigenvalue M of the spin operator Stotalz. Because of the reduced number of Ising basis states in the subspaces with higher M we are able to diagonalize systems with up to N=144 spins. We find evidence that the Marshall-Peierls sign rule survives for a relatively large frustration parameter J2.
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