Invariant Energy Levels and Flat Band Engineering in a Kondo Lattice Model on Geometrically Frustrated Lattices [article]

Masafumi Udagawa, Hiroaki Ishizuka, Yukitoshi Motome
<span title="2013-10-17">2013</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We show the existence of invariant energy levels in a Kondo lattice model on an isolated complete graph, such as a triangle and a tetrahedron. These energy levels always have fixed eigenenergies t ± J/2, irrespective of the configuration of localized moments (t is the transfer integral of conduction electrons and J is the spin-charge coupling constant). We also extend the analysis to geometrically frustrated lattices by using the complete graphs as basic building blocks. We show that the
more &raquo; ... ction rule for the invariant energy levels leads to the existence condition of localized states, if the model is defined on the triangle-based line graphs, such as a kagome lattice. We further propose a procedure of engineering isolated flat bands with broken time-reversal symmetry, which are separated from other dispersive bands with finite energy gaps.
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