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TT: Fachverband Tiefe Temperaturen

TT 68: SYLM: Optics and Light-Matter Interaction with Excitons in 2D Materials (joint symposium DS, DY, HL, TT, organized by HL)

TT 68.1: Hauptvortrag

Donnerstag, 23. März 2017, 15:00–15:30, HSZ 02

Light matter interaction in TMDs and their heterostructures — •Ursula Wurstbauer — Walter Schottky Institute and Physics-Department, TU Munich — Nanosystems Initiative Munich (NIM)

Transition metal dichalcogenides (TMDs) such as MoS2 are of current interest for optoelectronic, sensing and energy harvesting applications, but also for studying fundamental aspects of light-matter interaction in strictly two-dimensional semiconductors [1,2]. These materials exhibit a high sun light absorbance of up to 15% in the monolayer limit [3], photocatalytic stability [4] and access to excitonic phenomena in van der Waals heterostructures. We access the complex dielectric function and their fine-structure by spectroscopic imaging ellipsometry [3]. The importance of excitonic effects emerge also in resonant Raman spectroscopy, where unexpected polarization dependence points towards strong exciton-phonon coupling in MoS2. We furthermore achieve strong signatures for interlayer coupling and the formation of presumably long-lived interlayer excitons in such van der Waals heterostructures.

We acknowledge support by BaCaTeC and DFG via Nanosystems Initiative Munich (NIM), and project WU 637/4-1.

[1] U. Wurstbauer et al. arXiv:1611.05255 (2016). [2] B. Miller, et al., Appl. Phys. Lett. 106, 122103 (2015). [3] S. Funke et al., J. Phys. Condens. Matter 28, 385301 (2016). [4] E. Parzinger et al. ACS Nano 9(11), 11302 (2015).