"Espectro de excitação para modelos quânticos na rede"

Abstract

Uma transformação de staggering é utilizada para relacionar os casos de potenciais atrativos e repulsivos e o espectro dos hamiltonianos e suas autofunções. system is characterized by a single site "a priori" spin probability distribution. We work only at high temperature region (0 < β 1). The energy-momentum spectrum exhibits isolated dispersion curves which are identified as single particles and multiparticle bands. In particular, we study states of one and two-particles.For the single particle spectrum, we obtain the dispersion curve and the