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Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 11: Postersession (Eröffnung)

O 11.22: Poster

Monday, March 27, 2000, 19:00–22:00, Bereich C

Determination of the polytype of epitaxial TaS2 — •Christian Kreis, Sascha Werth, Rainer Adelung, Jörn Kanzow, Lutz Kipp, and Michael Skibowski — Leibnizstrase 19, 24118 Kiel

Determination of the polytype of epitaxial TaS2

Thin epitaxial films in the submonolayer regime up to a few

monolayers of the layered transition metal dichalcogenide

(TMDC) TaS2 were grown on metallic and semiconducting TMDCs by

van der Waals epitaxy. The coordination of the tantalum and

sulfur atoms in one layer, that can be either octahedral

(1T polytype) or trigonal prismatic (2H polytype), is crucial

for the formation of charge density waves (CDWs) and the

electronic structure around Fermi level. While the 1T polytype of

bulk TaS2 already shows CDWs at room temperature the 2H polytype

is susceptible to CDWs only below 76K. Further on, both polytypes

exhibit different phase diagrams with changing temperature.

Thus temperature dependent ultra-violet photoemission

spectroscopy and X-ray photoemission spectroscopy were applied

to epitaxial TaS2 and compared with measurements of 1T and 2H

TaS2 bulk crystals to give insight into the coordination of the

epitaxial layers and the existence of CDWs. The geometrical

structure of the TaS2 layers was characterized using scanning

tunneling microscopy.

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