Absence of metallicity in Cs-GaAs(110): A Hubbard-model study
Phys. Rev. B 47, 16391 – Published 15 June, 1993
DOI: https://doi.org/10.1103/PhysRevB.47.16391
Abstract
Using an approximate solution of the Hubbard-model Hamiltonian, we are able to establish that the Cs-GaAs(110) system becomes a Mott insulator at submonolayer Cs coverages. We also provide a consistent interpretation of electron-energy-loss and scanning-tunneling-spectroscopies data. The correlation effects are important for this system with an estimated correlation energy of 0.4 eV.