Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 99: 2D materials beyond graphene: TMDCs, silicene and relatives IV

O 99.1: Vortrag

Donnerstag, 15. März 2018, 15:00–15:15, MA 043

Ultrafast Dynamics of Single Layer TaS₂ — •Federico Andreatta¹, Antonija G. Čabo¹, Deepnarayan Biswas², Charlotte E. Sanders¹, Marco Bianchi¹, Cephise Cacho³, Alfred Jones³, Richard T. Chapman³, Emma Springate³, Phil D. C. King², Jill A. Miwa¹, Søren Ulstrup¹, and Philip Hofmann¹ — ¹Aarhus University, DK — ²University of St. Andrews, UK — ³CLF, STFC Rutherford Appleton Laboratory, UK

Metallic transition metal dichalocogenides, synthesized on single crystal metal substrates, have been recently explored down to the single layer limit^1,2. Here, we synthesize metallic single layer tantalum disulphide (TaS₂) on graphene on silicon carbide to create a model two-dimensional van der Waals heterostructure. Not only do we probe the static electronic properties of the single layer TaS₂ but also the nonequilibrium carrier dynamics by means of time-and-angle resolved photoemission spectroscopy³. We present a novel way to fit the spectral function of the band dispersion at the Fermi level so that the band renormalization is tracked on a femtosecond time-scale.

[1] M. Dendzik, et al. Physical Review B, 92(24), 2015. [2] C. E. Sanders, et al. Physical Review B, 94(8), 2016. [3] S. Ulstrup, et al. ACS Nano, 10(6):6315-6322, 2016.