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Bulletin of the American Physical Society

Strongly-correlated electrons on the 1/5-depleted square lattice Hubbard model

Ehsan Khatami, Rajiv R. P. Singh, Warren E. Pickett, Richard T. Scalettar

Published Mar 6, 2015• 0 citations
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We investigate a nonmagnetic metal-insulator transition in the 1/5-depleted square lattice Hubbard model at half filling within the eight-site cellular dynamical mean field theory. We find that a metal-insulator transition without any signatures of a first-order transition, a continuous Mott transition, takes place in a certain range of parameters. The nature of the continuous Mott transition is merely a Lifshitz transition driven by the on-site Coulomb interaction. The renormalized matrix elements of hoppings and the spin-spin correlation functions reveal that the physics of this transition is a strong enhancement of the dimerization due to the nonlocal effects of the electron-electron interaction.