The Shockley surface state located at $\overline{\mathrm{Y}}$ on the $(1\times 2)$-reconstructed Au(110) surface is predicted to exhibit a Rashba-type spin splitting. Previous photoemission experiments searched for this splitting but it could not be resolved yet. In order to uncover a possible splitting, the unoccupied surface state on Au(110) is examined with spin- and angle-resolved inverse photoemission, whereas Na-covered Au(110) allows for investigation of the now occupied surface state by means of spin- and angle-resolved direct photoemission. Our data show clear spin splittings in the order of $100\mathrm{meV}$ with a sign reversal at $\overline{\mathrm{Y}}$ in the surface state's in-plane spin components which is characteristic for a Rashba-type behavior. Furthermore, we deduce an effective mass of $m^{*}=(0.27\pm 0.02)m_e$ and a Rashba parameter of ${\alpha }_R=(0.46\pm 0.04)\mathrm{eV}\AA$ from direct photoemission measurements.

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• Electronic structure
• Rashba coupling
• Spin-orbit coupling
• Surface reconstruction
• Surface states
• Face-centered cubic
• Noble metals
• Single crystal materials
• Surfaces
• Two-dimensional electron system
• Angle-resolved photoemission spectroscopy
• Photoemission spectroscopy
• Spin-resolved photoemission spectroscopy
• Ultraviolet photoelectron spectroscopy