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Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 30: SrTiO3: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor III (joint session TT/KFM/MA/O)

KFM 30.2: Vortrag

Freitag, 22. März 2024, 09:45–10:00, H 0104

Two-dimensional electron liquids at truly bulk-terminated SrTiO3 — •Igor Sokolović1,2, Eduardo B. Guedes3, Thomas van Waas4, Samuel Poncé4,5, Craig M. Polley6, Michael Schmid2, Ulrike Diebold2, Milan Radović3, Martin Setvín2,7, and J. Hugo Dil3,81Institute of Microelectronics, TU Wien, Vienna, Austria — 2Institute of Applied Physics, TU Wien, Vienna, Austria — 3Photon Science Division, PSI, Villagen, Switzerland — 4ETSF, Institute of Condensed Matter and Nanosciences, UCLouvain, Louvain-la-Neuve, Belgium — 5WEL Research Institute, Wavre, Belgium — 6MAX IV laboratory, Lund University, Lund, Sweden — 7Faculty of Mathematics and Physics, Charles University, Prague , Czech Republic — 8Institut de Physique, ÉPFL, Lausanne, Switzerland

A truly bulk-terminated SrTiO3(001) surface prepared by cleaving in situ was investigated with angle-resolved photoemission spectroscopy (ARPES) and noncontact atomic force microscopy (ncAFM). The (1×1) SrTiO3(001) surfaces were achieved through our cleaving procedure that exploits the strain-induced ferroelectric transition in SrTiO3, and provides both possible surface terminations, TiO2 and SrO. Each hosts a specific two-dimensional electron liquid (2DEL): the first with split and the other with degenerate bands. The origin of the 2DELs and the band-splitting mechanisms are elucidated by correlating the observed reciprocal- and real-space electronic and atomic structure.

Keywords: SrTiO3(001) (1x1); Incipient ferroelectricity; ARPES; ncAFM; 2DEG / 2DEL

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