Splitting of monolayer out-of-plane A '(1) Raman mode in few-layer WS2

Staiger M, Gillen R, Scheuschner N, Ochedowski O, Kampmann F, Schleberger M, Thomsen C, Maultzsch J (2015)

Publication Status: Published

Publication Type: Journal article

Publication year: 2015

Journal

Physical Review B American Physical Society

Publisher: AMER PHYSICAL SOC

Book Volume: 91

Journal Issue: 19

DOI: 10.1103/PhysRevB.91.195419

Abstract

We present Raman measurements of mono-and few-layer WS2. We study the monolayer A'(1) mode around 420 cm(-1) and its evolution with the number of layers. We show that with increasing layer number there are an increasing number of possible vibrational patterns for the out-of-plane Raman mode: in N-layer WS2 there are N Gamma-point phonons evolving from the A'(1) monolayer mode. For an excitation energy close to resonance with the A excitonic transition energy, we were able to observe all of these N components, irrespective of their Raman activity. Density functional theory calculations support the experimental findings and make it possible to attribute the modes to their respective symmetries. The findings described here are of general importance for all other phonon modes in WS2 and other layered transition-metal dichalcogenide systems in the few-layer regime.

Authors with CRIS profile

Roland Gillen Lehrstuhl für Experimentalphysik Janina Maultzsch Lehrstuhl für Experimentalphysik

Involved external institutions

Technische Universität Berlin DE Germany (DE) Universität Duisburg-Essen (UDE) DE Germany (DE)

How to cite

APA:

Staiger, M., Gillen, R., Scheuschner, N., Ochedowski, O., Kampmann, F., Schleberger, M.,... Maultzsch, J. (2015). Splitting of monolayer out-of-plane A '(1) Raman mode in few-layer WS2. Physical Review B, 91(19). https://doi.org/10.1103/PhysRevB.91.195419

MLA:

Staiger, Matthias, et al. "Splitting of monolayer out-of-plane A '(1) Raman mode in few-layer WS2." Physical Review B 91.19 (2015).

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