Abstract
AbstractWe investigate the effects of the inter‐site interactions on the exciton Mott transition using the extended Hubbard model for the electron–hole systems, which incorporates both repulsive (electron–electron and hole–hole) and attractive (electron–hole) inter‐site interactions in addition to the on‐site Hubbard interactions. The analysis by means of the extended dynamical mean‐field theory clarifies that the inter‐site interactions do not change the nature of the exciton Mott transition in high dimensions but tend to stabilize the metallic electron–hole plasma state, when the inter‐site repulsive and attractive interactions have the same strength. In contrast, we find that small difference between the repulsive and attractive interactions dramatically changes the electronic states. This small perturbation strongly enhances fluctuations of the mass density, and drives the system to the insulator with the strong fluctuations of the mass density wave. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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