Strongly anisotropic spin and orbital Rashba effect at a tellurium – noble metal interface

B. Geldiyev; M. Ünzelmann; P. Eck; T. Kißlinger; J. Schusser; T. Figgemeier; P. Kagerer; N. Tezak; M. Krivenkov; A. Varykhalov; A. Fedorov; L. Nicolaï; J. Minár; K. Miyamoto; T. Okuda; K. Shimada; D. Di Sante; G. Sangiovanni; L. Hammer; M. A. Schneider; H. Bentmann; F. Reinert

doi:10.1103/PhysRevB.108.L121107

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Strongly anisotropic spin and orbital Rashba effect at a tellurium – noble metal interface

B. Geldiyev¹, M. Ünzelmann ^1,*, P. Eck², T. Kißlinger³, J. Schusser ¹, T. Figgemeier¹, P. Kagerer ¹, N. Tezak¹, M. Krivenkov⁴ et al.

A. Varykhalov⁴, A. Fedorov^4,5,6, L. Nicolaï ⁷, J. Minár⁷, K. Miyamoto⁸, T. Okuda⁸, K. Shimada ⁸, D. Di Sante⁹, G. Sangiovanni², L. Hammer ³, M. A. Schneider ³, H. Bentmann^1,†, and F. Reinert ¹

¹Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
²Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
³Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstraße 7, D-91058 Erlangen, Germany
⁴Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Straße 15, D-12489 Berlin, Germany
⁵Leibniz Institute for Solid State and Materials Research, IFW Dresden and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtzstraße 20, D-01069 Dresden, Germany
⁶Joint Laboratory “Functional Quantum Materials” at BESSY II, Albert-Einstein-Straße 15, D-12489 Berlin, Germany
⁷New Technologies - Research Center, University of West Bohemia, CZ-30100 Pilsen, Czech Republic
⁸Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
⁹Department of Physics and Astronomy, University of Bologna, I-40127 Bologna, Italy

^*muenzelmann@physik.uni-wuerzburg.de
^†Present address: Center for Quantum Spintronics (QuSpin), NTNU Trondheim, NO-7034 Trondheim, Norway.

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Phys. Rev. B 108, L121107 – Published 14 September, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L121107

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 $\bar{X}$ 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.

Physical Review B

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Strongly anisotropic spin and orbital Rashba effect at a tellurium – noble metal interface

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Strongly anisotropic spin and orbital Rashba effect at a tellurium – noble metal interface

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