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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: 2D Materials V: Growth, Structure and Substrate Interaction (joint session O/CPP)

CPP 40.4: Talk

Wednesday, March 29, 2023, 15:45–16:00, GER 37

Reaction of submonolayer amounts of Ti and Te on Au(111) — •Andreas Raabgrund, Tilman Kisslinger, Lutz Hammer, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Titanium ditelluride (TiTe2) belongs to the family of layered 2D transition metal dichalcogenides. It achieved a lot of attention due to the emergence of a charge density wave in the single layer limit. Thicker films, however, do not show this transition [1]. Aiming the MBE growth of TiTe2 we investigated the initial growth of titanium telluride structures on Au(111) both structurally and electronically by STM, STS, LEED-IV structural analysis, and DFT. For a Te coverage of 0.4 ML and a Ti coverage of 0.2 ML on Au(111) a chain-like (5×√3)_rect superstructure is formed. Our LEED-IV best-fit structure with a Pendry R factor of 0.11 (redundancy ρ=9.6) reveals incorporated Ti atoms each of which forms bonds to two Te atoms residing in approximately hollow positions. Our findings regarding the (5×√3)_rect superstructure disprove the proposed TiTe2 monolayer on Au(111) [2]. STS shows an approximately 0.5 eV (FWHM) wide peak at +1 V which we can correlate to the density of Ti d-states as obtained from DFT.
[1] P. Chen et al., Nat. Commun. 8, 516 (2017)
[2] Z. Song et al., Chin. Phys. B 102, 056801 (2019)