EXACT RESULTS IN STRONGLY CORRELATED ELECTRONS — SPIN-REFLECTION POSITIVITY AND THE PERRON-FROBENIUS THEOREM
Takashi Yanagisawa, Yukihiro Shimoi
This article is devoted to discuss two exact arguments in strongly-correlated electron systems: one is the method of reflection positivity in the spin space and the other is the Perron-Frobenius theorem in matrix theory. For several specific systems, we can show that the ground state is unique and we can predict the total spin of the ground state.
International Journal of Modern Physics B•Nov 15, 1996•35 citations