Dynamical Breakup of the Fermi Surface in a doped Mott Insulator

TL;DR

This paper investigates how the Fermi surface in a doped Mott insulator breaks up non-uniformly during the transition from metallic to insulating phases, revealing hot and cold regions influenced by carrier type.

Contribution

It demonstrates the momentum-dependent nature of the Mott transition using Cellular Dynamical Mean-Field Theory, highlighting the non-uniform evolution of the Fermi surface.

Findings

Fermi surface breaks up non-uniformly during the transition.

Hot and cold regions form depending on carrier type.

Transition occurs via a momentum-space differentiation.

Abstract

The evolution from an anomalous metallic phase to a Mott insulator within the two-dimensional Hubbard model is investigated by means of the Cellular Dynamical Mean-Field Theory. We show that the density-driven Mott metal-insulator transition is approached in a non-uniform way in different regions of the momentum space. This gives rise to a breakup of the Fermi surface and to the formation of hot and cold regions, whose position depends on the hole or electron like nature of the carriers in the system.