Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: 2D Materials I – Excitonic properties
HL 3.4: Vortrag
Montag, 9. März 2026, 10:15–10:30, POT/0081
Anisotropic Excitonic Response in MoSe2-WSe2 Lateral Heterostructures — •Miguel Morales Cocera1,2, Franz Fischer1,2, Carl Emil Mørch Nielsen1, and Gabriel Bester1 — 1University of Hamburg, Institute of Physical Chemistry, 22761 Hamburg, Germany — 2Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
We investigate lateral heterostructures of transition-metal dichalcogenide monolayers, in particular MoSe2-WSe2. In these systems, the one-dimensional (1D) interface together with the type-II band alignment enables the emergence of 1D exciton physics within a two-dimensional monolayer material, with the "inter-layer" excitons retaining near monolayer-level brightness. Motivated by the recent experimental observation of these spatially indirect excitons [1], we calculate the exciton and trion fine structure using ab initio many-body screened configuration interaction [2]. We find that the lowest bright exciton state is non-degenerate due to the loss of symmetry induced by the 1D interface. Moreover, the many-body dipoles of these two excitons lie along different in-plane polarization axes, leading to an anisotropic optical response that may be useful for optoelectronic applications.
[1] R. Rosati, et al., Nat. Commun. 14, 2438 (2023)
[2] Mørch Nielsen, C.E., Fischer, F. & Bester, G. npj 2D Mater. Appl. 9, 11 (2025)
Keywords: Excitons; Trions; Lateral Heterostructures; Transition Metal Dichalcogenides; Monolayers