Quantum phase transition in a gapped Anderson model: A numerical renormalization group study
Quantum phase transition in a gapped Anderson model: A numerical renormalization group study
We use the numerical renormalization group method to investigate the spectral properties of a single-impurity Anderson model with a gap $\ensuremath{\delta}$ across the Fermi level in the conduction-electron spectrum. For any finite $\ensuremath{\delta}>0$, at half filling the ground state of the system is always a doublet. Away from half filling …