Impact of Mechanical Strain on Optical and Vibrational Properties of 2D Materials

Prof. Konstantinos Papagelis (Aristotle University of Thessaloniki & IFORTH/ICE-HT, Greece)

Abstract: The application of mechanical strain in two-dimensional (2D) materials such as single- and few-layer graphene, as well as transition metal dichalcogenides (e.g. MoS₂, WS₂), is a powerful perturbation for effectively tailoring their optical and electronic properties. This approach not only enables diverse device applications but also reveals rich and fundamental physical phenomena. Raman and photoluminescence spectroscopy have proven to be highly effective techniques for probing the influence of uniaxial, compressive, and hydrostatic (biaxial) strain in these materials. In this speech, recent results on the Raman and photoluminescence response of selected 2D materials under both uniaxial and biaxial strain conditions will be presented. These findings will be complemented by theoretical analysis based on molecular dynamics simulations with accurate atomistic potentials and first-principles calculations, providing deeper insight into the underlying mechanisms. These results have important implications for the development of flexible electronics and offer pathways for optimizing performance across a range of advanced material applications.

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