Abstract
The authors investigate the properties of a two-dimensional Kondo lattice represented by a noncentrosymmetric Si-Ir-Si-Yb four-layer block at the surface of the heavy-fermion material YbIr${}_{2}$Si${}_{2}$. Strong spin-orbit coupling of Ir atoms induces spin polarization of two-dimensional itinerant surface states confined in this block, while the lattice of Yb 4$f$ moments acts as a source for coherent field interplay. Remarkably, apart from the anticipated Rashba-like splitting of the two-dimensional itinerant states, a tiny spin splitting of the Yb 4$f$ states of the block is also revealed. Electrons in these 4$f$ states interact in a temperature-dependent fashion with highly mobile spin-polarized itinerant states, gently guiding their properties.
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