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Center for Nonlinear Studies |
Two-dimensional (2D) materials have gained increasing attention due to their unique and extraordinary electrical and optoelectronic properties. These properties can be largely attributed to the fundamental light-matter interactions. In this talk, I will discuss the study of the light-matter interaction in 2D materials using spectroscopy techniques, as well as their coupling with other nanostructures. In the first part of my talk, I will present the fundamental properties of 2D materials investigated using spectroscopy, including MoS2 and defects studied using photoluminescence and X-ray photoelectron spectroscopies, interlayer coupling of twisted bilayer MoS2 and few-layer black phosphorus (BP) investigated using low-frequency Raman spectroscopies, as well as anisotropic light-matter interactions of BP and other 2D materials with in-plane anisotropy using polarization-dependent Raman and optical absorption spectroscopies. In the second part of the talk, I will discuss the interaction of 2D materials with other materials systems. The interactions of 2D materials and selected organic molecules are revealed using graphene-enhanced Raman spectroscopy. The interaction between 2D materials and plasmonic nanocavities were found to exhibit an interesting wavelength dependent Raman enhancement phenomenon. The works presented in this talk are significant fundamentally, and also offer useful guidelines for practical applications of 2D materials in electronics and optoelectronics.
Host: Han Htoon (htoon@lanl.gov)