Direct Mapping of Spin and Orbital Entangled Wavefunction under Interband Spin-Orbit coupling of Rashba Spin-Split Surface States

Abstract

We use spin- and angle-resolved photoemission spectroscopy (SARPES) combined with polarization-variable laser and investigate the spin-orbit coupling effect under interband hybridization of Rashba spin-split states for the surface alloys Bi/Ag(111) and Bi/Cu(111). In addition to the conventional band mapping of photoemission for Rashba spin-splitting, the different orbital and spin parts of the surface wavefucntion are directly imaged into energy-momentum space. It is unambiguously revealed that the interband spin-orbit coupling modifies the spin and orbital character of the Rashba surface states leading to the enriched spin-orbital entanglement and the pronounced momentum dependence of the spin-polarization. The hybridization thus strongly deviates the spin and orbital characters from the standard Rashba model. The complex spin texture under interband spin-orbit hybridyzation proposed by first-principles calculation is experimentally unraveled by SARPES with a combination of p- and s-polarized light.

6 pages, 4 figures

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• Strong Linear Dichroism in Spin-Polarized Photoemission from Spin-Orbit-Coupled Surface States
• Structure and electronic properties of the ($\sqrt{3}\times \sqrt{3}$)$R30^{\circ }$ SnAu${}_2$/Au(111) surface alloy
• Spin-dependent two-photon Bragg scattering in the Kapitza-Dirac effect
• Charge-Spin Conversion in Two-Subband Quantum Wells with Conventional and Unconventional Rashba Spin-Orbit Coupling
• Visualization of optical polarization transfer to photoelectron spin vector emitted from the spin-orbit coupled surface state
• Optical study on electronic structure of the locally non-centrosymmetric CeRh${}_2$As${}_2$
• Scaling law for the Rashba-type spin splitting in quantum well films
• Fluctuated spin-orbital texture of Rashba-split surface states in real and reciprocal space
• Development of a 10.8-eV Tabletop Femtosecond Laser with Tunable Polarization for High-Resolution Angle-Resolved Photoemission Spectroscopy
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