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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: Talk
Friday, March 22, 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 Dil3,8 — 1Institute 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