5 papers · 1 filter
Spectral properties of strongly correlated multi impurity models in the Kondo insulator regime: Emergent coherence, metallic surface states and quantum phase transitions
Fabian Eickhoff, Frithjof B. Anders
We investigate the real-space spectral properties of strongly-correlated multi-impurity arrays in the Kondo insulator regime. Employing a recently developed mapping onto an effecti…
Kondo holes in strongly correlated impurity arrays: RKKY driven Kondo screening and hole-hole interactions
Fabian Eickhoff, Frithjof B. Anders
The emerging and screening of local magnetic moments in solids has been investigated for more than 60 years. Local vacancies as in graphene or in Heavy Fermions can induce decouple…
Strongly correlated multi-impurity models: The crossover from a single-impurity problem to lattice models
Fabian Eickhoff, Frithjof B. Anders
We present a mapping of correlated multi-impurity Anderson models to a cluster model coupled to a number of effective conduction bands capturing its essential low-energy physics. T…
Symmetric single-impurity Kondo model on a tight-binding chain: a comparison of analytical and numerical ground-state approaches
Gergely Barcza, Kevin Bauerbach, Fabian Eickhoff +3
We analyze the ground-state energy, local spin correlation, impurity spin polarization, impurity-induced magnetization, and corresponding zero-field susceptibilities of the symmetr…
Effective low-energy description of the two impurity Anderson model: RKKY interaction and quantum criticality
Fabian Eickhoff, Benedikt Lechtenberg, Frithjof B. Anders
We show that the RKKY interaction in the two-impurity Anderson model comprise two contributions: a ferromagnetic part stemming from the symmetrized hybridization functions and an a…