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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 Sokolović^1,2, Eduardo B. Guedes³, Thomas van Waas⁴, Samuel Poncé^4,5, Craig M. Polley⁶, Michael Schmid², Ulrike Diebold², Milan Radović³, Martin Setvín^2,7, and J. Hugo Dil^3,8 — 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