Signatures of the Fermi surface reconstruction of a doped Mott insulator in a slab geometry
Phys. Rev. B 112, 155155 – Published 24 October, 2025
DOI: https://doi.org/10.1103/hyth-626t
Abstract
We investigate a hole-doped Mott insulator in a slab geometry using the dynamical cluster approximation. We show that the enhancement of the correlation strength at the surface results in the remarkable evolution of the layer-projected Fermi surface, which exhibits holelike pockets in the superficial layers, but gradually evolves into a single electronlike surface in the innermost layers. We further analyze the behavior of the Friedel oscillations induced by the surface and identify distinct signatures of the Fermi surface reconstruction as function of hole doping. In addition, we introduce a computationally tractable quantity that diagnoses the same Fermi surface variation by the concurrent breakdown of Luttinger's theorem. Both the latter quantity and the Friedel oscillations serve as reliable indicators of the change in Fermi surface topology, without the need for any periodization in momentum space.
