Abstract
In condensed matter, a tremendous effort has been generated to realise Kondo lattices both experimentally and theoretically. The pursuit of independent magnetic moments, via charge localization, is paramount for applications in nanotechnology. Particularly, systems with simultaneous charge/spin degrees of freedom can manifest both Kondo spin quenching and Mott–Hubbard charge localization. Experimental frameworks illuminating pathways between the two are physically and technologically significant, and hardly observed in reality. Recent developments in controlling densities/temperatures of strongly correlated impurities on surfaces has opened up new possibilities. Such systems introduce mechanisms to study Kondo/Mott-physics interplay methodically. However, the pathway between Kondo physics and charge localization remains elusive. In this work, we investigate the phase diagram of superlattice structures of f-elements on substrates, assessing required conditions for obtaining Kondo superlattices. We unveil pathways between Kondo quenching and Mott localization, and identify non-trivial charge density waves emerging from the competition of charge localization and Kondo physics.
Highlights
In condensed matter, a tremendous effort has been generated to realise Kondo lattices both experimentally and theoretically
We use a combination of dynamical mean field theory (DMFT) and tight binding calculations for a triangular lattice substrate, techniques which have been utilised on previous works concerning other superstructures[19,37,38]
We report the stabilization of a charge density wave competing with Kondo physics at large inter-adatom distances
Summary
A tremendous effort has been generated to realise Kondo lattices both experimentally and theoretically. Recent developments in controlling densities/temperatures of strongly correlated impurities on surfaces has opened up new possibilities Such systems introduce mechanisms to study Kondo/Mott-physics interplay methodically. Due to the comparatively low coordination between adatoms and substrate, single atom magnets in the form of Pt/Ho11–13 have been debated and magnetic hysteresis of Er trimers on Cu have been observed[14] These phenomena have attracted a wide academic interest, and offer pathways towards industrial applications, for example as candidates for future atomic scale memory storage[15,16,17]. To paint a picture of the phenomena observed in this work, an overview of impurity lattice physics is due: a single Kondo adatom within a material does not conserve momentum when scattering electrons. We present our investigations into the generic properties of single orbital correlated adatom structure upon a triangular metallic substrate. We study the strength of correlations, quantified by the quasi-particle weight factor (Z), and examine the electron localization at the adatom and its impact on the correlated energy bands and Fermi surfaces
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