Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: 2D Materials III: Electronic Structure (joint session O/TT)
TT 42.6: Vortrag
Mittwoch, 20. März 2024, 11:45–12:00, MA 005
Inelastic tunneling into polaronic bound states in single-layer MoS2 — Camiel van Efferen1, Arne Schobert2, Tfyeche Tounsi1, Michael Winter2, Mark Georger1, Affan Safeer1, Christian Krämer1, Jeison Fischer1, Jan Berges3, Thomas Michely1, •Roberto Mozara2, Tim Wehling2,4, and Wouter Jolie1 — 1II. Physikalisches Institut, U zu Köln — 2I. Institut für Theoretische Physik, U Hamburg — 3U Bremen Excellence Chair, Bremen Center for Computational Materials Science, and MAPEX Center for Materials and Processes — 4The Hamburg Centre for Ultrafast Imaging
The presentation delves into the nuanced conductivity of two-dimensional MoS2, a prominent transition metal dichalgogenide, by examining its response to doping-induced variations. In particular, we explore the intriguing phenomena of polarons, quasiparticles that emerge from the interplay of electrons with lattice vibrations. Employing advanced techniques such as scanning tunneling microscopy and spectroscopy, we unveil the manifestation of polaronic bound states in metallic 2D MoS2, shedding light on their stability and formation dynamics. The investigation is enriched by density-functional theory calculations with a recently developed electron-lattice downfolding technique, emphasizing the role of renormalized M-phonons in shaping the electronic landscape of metallic MoS2. This synthesis of experimental insights and theoretical perspectives offers a comprehensive understanding of the interplay between electrons and phonons in 2D MoS2.
Keywords: transition metal dichalgogenides; two-dimensional systems; molybdenum disulfide; electron-phonon coupling; polarons