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O: Fachverband Oberflächenphysik
O 91: 2D materials beyond graphene: TMDCs, silicene and relatives III
O 91.3: Vortrag
Donnerstag, 15. März 2018, 11:00–11:15, MA 043
Synthesis and properties of single-layer VS2 on Au (111) — •Raluca-Maria Stan1, Fabian Arnold1, Charlotte Sanders1, Albert Bruix1, Sanjoy Mahatha1, Henriette Lund1, Maciej Denzik1, Davide Curcio1, Harsh Bana2, Elisabetta Travaglia2, Luca Bignardi3, Paolo Lacovig3, Daniel Lizzit3, Marco Bianchi1, Jill Miwa1, Martin Bremholm4, Silvano Lizzit3, and Philip Hofmann1 — 1Dep. of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark. — 2Dep. of Physics, University of Trieste, Trieste, Italy. — 3Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy. — 4Dep. of Chemistry, University of Aarhus, Aarhus, Denmark.
The single-layer (SL) transitional metal dichalcogenide vanadium disulfide (VS2) has attracted interest due to predicted intrinsic ferromagnetism that could be exploited in future spintronic applications and data storage devices. For the first time, SL VS2 of the 1T variety has been synthesized on Au (111). The SL has metallic character and a strong preference to form triangular islands with a moiré superstructure and a well-defined orientation with respect to the substrate. Annealing to temperatures higher than 450 ∘C, two phase transitions are observed: one phase exhibits a distorted hexagonal unit cell while the other one has a rectangular unit cell characterized by a sulfur deficiency. The unexpected latter phase is reached upon annealing in ultra-high vacuum to temperatures higher than 550 ∘C. The transition between these phases is reversible upon annealing at lower temperatures in high H2S pressure.