Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.176401
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [258499086-SFB1170]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat [39085490EXC 2147]
- U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- Gauss Centre for Supercomputing e.V.
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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 experiments for a monolayer AgTe on Ag(111). Using quantitative low-energy electron diffraction analysis, we determine the structural parameters and the stacking of the honeycomb overlayer with picometer precision. Based on an orbitalsymmetry 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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