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Orbital-driven Rashba effect in a binary honeycomb monolayer AgTe

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arxiv 1912.05210 v1 pith:NQELKHO5 submitted 2019-12-11 cond-mat.mtrl-sci

Orbital-driven Rashba effect in a binary honeycomb monolayer AgTe

classification cond-mat.mtrl-sci
keywords agteeffectrashbaanalysisarpeselectronexistencehoneycomb
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Rashba effect is fundamental to the physics of two-dimensional electron systems and underlies a variety of spintronic phenomena. It has been proposed that the formation of Rashba-type spin splittings originates microscopically from the existence of orbital angular momentum (OAM) in the Bloch wave functions. Here, we present detailed experimental evidence for this OAM-based origin of the Rashba effect by angle-resolved photoemission (ARPES) and two-photon photoemission (2PPE) experiments for a monolayer AgTe on Ag(111). Using quantitative low-energy electron diffraction (LEED) analysis we determine the structural parameters and the stacking of the honeycomb overlayer with picometer precision. Based on an orbital-symmetry analysis in ARPES and supported by first-principles calculations, we unequivocally relate the presence and absence of Rashba-type spin splittings in different bands of AgTe to the existence of OAM.

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