Effective mass at the surface of a Fermi liquid

Abstract

Using the dynamical mean-field theory, we calculate the effective electron mass in the Hubbard model on a semi-infinite lattice. At the surface the effective mass is strongly enhanced. Near half-filling this gives rise to a correlation-driven one-electron surface mode.

LaTeX, 2 pages, 1 eps figure included, Physica B (in press), SCES 98

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