Institute of Applied Physics
Tuesday, 06th July 2021,16:00 s.t.
TU Wien, Freihaus HS 6, Tower A (green), 2nd floor, room: DA02K01
Wiedner Hauptstraße 8–10
The seminar will be also held as a Zoom Meeting:
Meeting ID: 960 6275 1637 Passcode: 9ANd8XWj
Complex oxide surfaces studied at the atomic scale by non-contact AFM/STM and DFT
The majority of solid state matter naturally appears in the form of an oxide, which are highly stable in atmospheric conditions, and therefore constitute a vast research area on a broad range of their properties.
I will present results obtained on two representative materials: The model binary oxide rutile TiO2(110) and the prototypical perovskite oxide SrTiO3(001) oxide. Both were studied at the atomic scale at low temperatures in ultrahigh vacuum using combined non-contact atomic force microscopy (nc-AFM) / scanning tunneling microscopy (STM) experimental setup, and the results were directly compared to density functional theory (DFT) theoretical modeling.
Rutile TiO2(110) interacts with the small O2  and CO  gas molecules by altering its polaronic ground state. A bulk-terminated SrTiO3(001) surface can be obtained only through ferroelectricity-assisted cleaving in ultrahigh vacuum [3,4], which proved as a promising physical system for further investigations. In addition to the underlying physics and chemistry that give rise to these phenomena, I will introduce the techniques and discuss recent advances in the applied experimental and theoretical methodologies.
 I. Sokolović, M. Reticcioli, et al. “Resolving the adsorption of molecular O2 on the rutile TiO2(110) surface by noncontact atomic force microscopy.” Proceedings of the National Academy of Sciences 117, 14827 (2020)
 M. Reticcioli, I. Sokolović, et al. “Interplay between adsorbates and polarons: CO on rutile TiO2(110).” Physical Review Letters 122, 016805 (2019)
 I. Sokolović, M. Schmid, et al. “Incipient ferroelectricity: A route towards bulk-terminated SrTiO3.” Physical Review Materials 3, 034407 (2019)
 I. Sokolović, G. Franceschi, et al. “Quest for a pristine unreconstructed SrTiO3(001) surface: An atomically resolved study via noncontact atomic force microscopy.” Physical Review B 103, L241406 (2021)