Quantum phase transition in a gapped Anderson model: A numerical renormalization group study

Details 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

2010-06-21

arxiv.org/abs/1006.4022v1

Phys. Rev. B 81, 235106 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 6 eps figures

Scientific paper

10.1103/PhysRevB.81.235106

We use the numerical renormalization group method to investigate the spectral properties of a single-impurity Anderson model with a gap {\delta} across the Fermi level in the conduction-electron spectrum. For any finite {\delta} > 0, at half filling the ground state of the system is always a doublet. Away from half filling a quantum phase transition (QPT) occurs as function of the gap value {\delta}, and the system evolves from the strong-coupling (SC) Kondo-type state, corresponding to {\delta} <{\delta}_C toward a localized moment (LM) regime for {\delta} > {\delta}_C. The opening of the gap leads to the formation of one (two) bound states when the system is in the SC (LM) regime. The evolution across the QPT of their positions and the corresponding weights together with the dynamic properties of the model are investigated.

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