Geldiyev, B.; Ünzelmann, M.; Eck, P.; Kißlinger, T.; Schusser, J.; Figgemeier, T.; Kagerer, P.; Tezak, N.; Krivenkov, M.; Varykhalov, A.; Fedorov, A.; Nicolaï, L.; Minár, J.; Miyamoto, K.; Okuda, T.; Shimada, K.; Di Sante, D.; Sangiovanni, G.; Hammer, L.; Schneider, M.A.; Bentmann, H.; Reinert, F.: Strongly anisotropic spin and orbital Rashba effect at a tellurium - noble metal interface. Physical Review B 108 (2023), p. L121107/1-7
10.1103/physrevb.108.l121107
Open Access Version (externer Anbieter)
Abstract:
We study the interplay of lattice, spin, and orbital degrees of freedom in a two-dimensional model system: a flat square lattice of Te atoms on a Au(100) surface. The atomic structure of the Te monolayer is determined by scanning tunneling microscopy and quantitative low-energy electron diffraction. Using spin- and angle-resolved photoelectron spectroscopy and density functional theory, we observe a Te-Au interface state with highly anisotropic Rashba-type spin-orbit splitting at the X point of the Brillouin zone. Based on a profound symmetry and tight-binding analysis, we show how in-plane square lattice symmetry and broken inversion symmetry at the Te-Au interface together enforce a remarkably anisotropic orbital Rashba effect which strongly modulates the spin splitting.