Metal-insulator transition in the presence of excitonic correlation

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  • Mucio A. Continentino
    Instituto de Física, Universidade Federal Fluminense, Campus da Praia Vermelha, Niterói 24.210-340, RJ, Brazil
  • Gloria M. Japiassú
    Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68.528, Rio de Janeiro 21.945-970, RJ, Brazil
  • Amós Troper
    Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, Rio de Janeiro 22.290-180, RJ, Brazil

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<jats:p>We study the possibility of an excitonic transition in a two-band model and show that a true phase transition does not occur in the presence of hybridization since the one-body mixing term acts as a conjugate field to the order parameter of the excitonic phase. We suggest an alternative interpretation for recent experiments on rare earth semiconductors based on a metal-insulator transition associated with the opening or closing of a hybridization gap at a critical pressure.</jats:p>

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