Effective mass at the surface of a Fermi liquid

TL;DR

This paper uses dynamical mean-field theory to study how the effective electron mass is enhanced at the surface of a Fermi liquid, revealing a correlation-driven surface mode near half-filling.

Contribution

It introduces a calculation of surface effective mass enhancement in the Hubbard model using dynamical mean-field theory, highlighting a novel surface mode.

Findings

Surface effective mass is strongly enhanced.

A correlation-driven one-electron surface mode appears near half-filling.

Surface effects are significant in Fermi liquids.

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.