Interband spin-orbit coupling between anti-parallel spin states in Pb quantum well states

Abstract

Using spin and angle-resolved photoemission spectroscopy we investigate a momentum region in Pb quantum well states on Si(111) where hybridization between Rashba-split bands alters the band structure significantly. Starting from the Rashba regime where the dispersion of the quasi-free two-dimensional electron gas is well described by two spin-polarized parabolas, we find a breakdown of the Rashba behavior which manifests itself (i) in a spin splitting that is no longer proportional to the in-plane momentum and (ii) in a reversal of the sign of the momentum splitting. Our experimental findings are well explained by including interband spin-orbit coupling that mixes Rashba-split states with anti-parallel rather than parallel spins. Similar results for Pb/Cu(111) reveal that the proposed hybridization scenario is independent on the supporting substrate.

10 pages, 7 figures

References in corpus (9)

• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• Silicon surface with giant spin-splitting
• Direct Measurement of the Out-of-Plane Spin Texture in the Dirac Cone Surface State of a Topological Insulator
• Spin-orbit splitting of the Shockley surface state on Cu(111)
• Rashba type spin-orbit splitting of quantum well states in ultrathin Pb films
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• Tunable spin-gaps in a quantum-confined geometry
• Unconventional Fermi surface spin textures in the Bi_xPb_{1-x}/Ag(111) surface alloy
• Controlling the effective mass of quantum well states in Pb/Si(111) by interface engineering

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• Operando imaging of all-electric spin texture manipulation in ferroelectric and multiferroic Rashba semiconductors
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• Ultrathin Films of Superconducting Metals as a Platform for Topological Superconductivity
• Large-Area Intercalated 2D-Pb/Graphene Heterostructure as a Platform for Generating Spin-Orbit Torque
• Majorana-like localized spin density without bound states in topologically trivial spin-orbit coupled nanowires
• Direct Visualization and Manipulation of Tunable Quantum Well State in Semiconducting Nb2SiTe4
• The Dirac paradox in 1+1 dimensions and its realization with spin-orbit coupled nanowires
• Electron transport in quantum channels with spin-orbit interaction: Effects of the sign of the Rashba coupling and applications to nanowires
• Confinement versus interface bound states in spin-orbit coupled nanowires