Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides III (joint session DS/MM/O)

O 89.4: Hauptvortrag

Donnerstag, 21. März 2024, 16:15–16:45, A 053

Ultrafast Photoexcitations in 2D MXenes — •Lyubov Titova — Worcester Polytechnic Institute, Worcester, MA, USA

MXenes are 2D transition metal carbides and nitrides with electronic properties that can be tuned by their chemistry and structure. Metallic-like conductivity, flexibility, high optical damage threshold and ease of processing owing to their hydrophilicity, make MXenes candidates for a host of electronic and optical applications. We use ultrafast optical and THz spectroscopic techniques to investigate the nature and behavior of photoexcitations in MXenes of different chemistries. We show that electronic and optical properties of MXenes can be engineered by choices of the transition metals and their order as well as by controlling the intercalants in the interlayer gaps. Furthermore, we demonstrate that MXenes with high free carrier density show promise as polarizers and tunable electromagnetic interference shields in the THz range.

Keywords: MXenes; Ultrafast; Plasmon; THz spectroscopy; Transient absorption