Phase diagram for the exciton Mott transition in infinite-dimensional electron-hole systems

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dc.creatorTomio, Yuh
dc.creatorOgawa, Tetsuo
dc.date2004-07-13
dc.date.accessioned2026-07-07T06:29:41Z
dc.date.available2026-07-07T06:29:41Z
dc.descriptionTo understand the essence of the exciton Mott transition in three-dimensional electron-hole systems, the metal-insulator transition is studied for a two-band Hubbard model in infinite dimensions with interactions of electron-electron (hole-hole) repulsion U and electron-hole attraction -U'. By using the dynamical mean-field theory, the phase diagram in the U-U' plane is obtained (which is exact in infinite dimensions) assuming that electron-hole pairs do not condense. When both electron and hole bands are half-filled, two types of insulating states appear: the Mott-Hubbard insulator for U > U' and the biexciton-like insulator for U < U'. Even when away from half-filling, we find the phase transition between the exciton- or biexciton-like insulator and a metallic state. This transition can be assigned to the exciton Mott transition, whereas the Mott-Hubbard transition is absent.
dc.description4 pages, 4 figures, submitted to EXCON '04
dc.identifierhttps://arxiv.org/abs/cond-mat/0407314
dc.identifierhttp://arxiv.org/abs/cond-mat/0407314
dc.identifierJournal of Luminescence 112, 220 (2005)
dc.identifierdoi:10.1016/j.jlumin.2004.09.060
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98122
dc.subjectStrongly Correlated Electrons
dc.titlePhase diagram for the exciton Mott transition in infinite-dimensional electron-hole systems
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