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O: Fachverband Oberflächenphysik
O 76: Electronic structure of surfaces: Spectroscopy, surface states II
O 76.7: Vortrag
Donnerstag, 12. März 2026, 12:00–12:15, HSZ/0201
Distinguishing bulk vs surface states from designed cleaving planes in ruthenium dioxide with ARPES — •Maria Visscher1,2, Lea Richter1, Sebastian Buchberger2, Shu Mo2, Bruno Saika2, Mats Leandersson3, Craig Polley3, Andrew Mackenzie1,2, and Phil King2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2University of St Andrews, St Andrews, UK — 3Max IV, Lund, Sweden
Ruthenium dioxide has a rich band structure, giving rise to phenomena like superconductivity under strain and hosting a Dirac nodal line network. Recent studies also found that the material hosts flat band surface states and unusual spin-polarisations. These phenomena motivate the need for more detailed studies into its electronic structure. ARPES would be an ideal probe for this, and there have been several pioneering studies to date. However, the material's strongly three-dimensional structure makes these experiments challenging because of difficulties both in preparing the required atomically flat and clean surfaces, and in disentangling bulk from surface states in the electronic structure. Here, we exploit a fabrication method based on Focused Ion Beam (FIB) structuring to stimulate cleaving along desired crystallographic planes. With this method, we obtained high quality surfaces in two distinct orientations, allowing high-resolution ARPES experiments. From this, and supporting density-functional calculations, we identify a rich hierarchy of bulk and surface states in this system and uncover a strong influence of structural relaxations and surface stoichiometry on the electronic states that form.
Keywords: ARPES; ruthenium dioxide