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HL: Fachverband Halbleiterphysik

HL 22: Focus Session: Young Semiconductor Forum

HL 22.6: Poster

Dienstag, 19. März 2024, 11:00–15:30, Poster F

Straintronics with van der Waals materials — •Emeline Nysten — Physikalisches Institut, Universität Münster, Germany

Surface acoustic waves (SAWs) have proven to be a multifaceted and efficient tool for the control of semiconductor nanostructures optical properties and the dynamical transport of charge carriers [1]. By integrating 2D semiconducting transition metal dichalcogenides (TMDCs) onto SAW-devices, we are able to investigate and control their interesting optoelectronic properties. Firstly, by systematically studying the SAW-modulated emission of a WSe₂ monolayer in the time domain, we unravel the impact of ubiquitous inhomogeneities in 2D TMDCs on charge carrier dynamics, outperforming conventional static photoluminescence measurements. Secondly, the study of the photogated SAW-induced acousto-electric effect in WSe₂ provides detailed insight into the underlying charge carrier dynamics and the nature of the contact between electrode and 2D semiconductor. Finally, I will discuss perspectives to employ SAW to selectively manipulate emergent phenomena like interfacial ferroelectricity and exciton dynamics in van der Waals heterostructures. [1] Delsing et al., "The 2019 surface acoustic waves roadmap" J. Phys. D:Appl. Phys. 52(35):353001 (2019)

Keywords: Surface acoustic waves; 2D semiconductors; Charge carrier dynamics