Metallic and insulating states in two-dimensional C60-polymers
نویسنده
چکیده
Variations in the band structures of the two-dimensional C60-polymers are studied, when π-conjugation conditions are changed. We investigate the rectangular and triangular polymers, in order to discuss metal-insulator transitions, using a semiempirical model with the Su-Schrieffer-Heeger type electronphonon interactions. We find that electronic structures change among directgap insulators and the metal, depending on the degree of π-conjugations in the rectangular polymer. The triangular polymer changes from the indirect gap insulator to the metal as the π-conjugations increase. High pressure experiments could observe such pressure-induced metal-insulator transitions. ∗E-mail address: [email protected]; URL: http://www.etl.go.jp/People/harigaya/.
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