Multiple magnetic impurities on surfaces: Scattering and quasiparticle interference
arXiv:1504.05421 · doi:10.1103/PhysRevB.91.235127
Abstract
We study systems of multiple interacting quantum impurities deposited on a metallic surface in a 3D host. For the real-space two-impurity problem, using numerical renormalization group calculations, a rich range of behavior is shown to arise due to the interplay between Kondo physics and effective RKKY interactions - provided the impurity separation is small. Such calculations allow identification of the minimum impurity separation required for a description in terms of independent impurities, and thereby the onset of the 'dilute impurity limit' in many-impurity systems. A 'dilute cluster' limit is also identified in systems with higher impurity density, where inter-impurity interactions are only important within independent clusters. We calculate the quasiparticle interference (QPI) due to two and many impurities, and explore the consequences of the independent impurity/cluster paradigms. Our results provide a framework to investigate the effects of disorder due to interacting impurities at experimentally relevant surface coverages.
13 pages, 7 figures
References in corpus (10)
- The numerical renormalization group method for quantum impurity systems
- Real-time dynamics in Quantum Impurity Systems: A Time-dependent Numerical Renormalization Group Approach
- Sum-rule Conserving Spectral Functions from the Numerical Renormalization Group
- A Numerical Renormalization Group approach to Green's Functions for Quantum Impurity Models
- Kondo decoherence: finding the right spin model for iron impurities in gold and silver
- Friedel oscillations and the Kondo screening cloud
- Universal low-temperature crossover in two-channel Kondo models
- Kondo effect on the surface of 3D topological insulators: Signatures in scanning tunneling spectroscopy
- Kondo versus indirect exchange: the role of the lattice and the actual range of RKKY interactions in real materials
- Coherence scale of coupled Anderson impurities