SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 7: 2D Materials and their Heterostructures IV
DS 7.4: Vortrag
Dienstag, 28. März 2023, 12:00–12:15, SCH A 316
New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide — Carlos Trallero-Giner1,2, Darío G. Santiago-Pérez3, and •Vladimir M. Fomin1,4 — 1Institute for Integrative Nanosciences (IIN), Leibniz IFW Dresden, D-01069 Dresden — 2Havana University, Havana 10400, Cuba — 3Universidad Autónoma del Estado de Morelos, CP 62209, Cuernavaca, Morelos, México — 4Moldova State University, MD-2009 Chişinău, Republic of Moldova
For transition metal dichalcogenide (TMD) semiconductors, the behavior of the magneto-polaron resonances (MPRs) is revealed as a function of the phonon symmetry inherent in the system. It is shown that the renormalized Landau energy levels are modified by the interplay of the long-range Pekar-Fröhlich (PF) and short-range deformation potential (DP) interactions. This interplay leads to a new series of MPRs involving the optical phonons at the center of the Brillouin zone. The coupling of the two Landau levels with the LO and A1 optical phonon modes provokes resonant splittings of double avoided-crossing levels giving rise to three excitation branches. To explore the interplay between the MPR, the electron-phonon interactions (PF and DP) and the couplings between adjacent Landau levels, a full Green’s function treatment for the evaluation of the energy and its life-time broadening is developed. A generalization of the two-level approach is performed for the description of the new MPR branches. The obtained results are a guideline for the magneto-optical experiments in TMDs, where three MPR peaks should be observable.