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Charge Tunable Optical Nonlinearity of Moiré Exciton-Polaritons
Zhijie Li, Kok Wee Song, Jens-Christian Drawer +16
Transition metal dichalcogenides represent a versatile platform to study strong light-matter interactions based on excitons and electrons in ordered lattices. Twist-engineering of…
Optimizing strong light-matter coupling of plasmonic lattices and monolayer semiconductors
Lukas Krelle, Lukas Husel, Kenji Watanabe +4
Exciton-polaritons provide a versatile platform for the study of a wide range of phenomena, including polariton lasers, topological polaritons, and bosonic condensation. Transition…
Deterministic and Scalable Quantum Light Generation in DNA Origami-Programmed Organic Molecule-MoS Monolayer Hybrids
Shen Zhao, Zhijie Li, Elisabeth Erber +8
The functionalization of atomically-thin transition metal dichalcogenides (TMDs) with organic molecules is a promising approach for realizing nanoscale optoelectronic devices with…
Excitons and trions in CrSBr bilayers
M. A. Semina, F. Tabataba-Vakili, A. Rupp +3
We study theoretically the neutral and charged excitons in two-dimensional semiconductors with anisotropic dispersion of charge carriers. Such a situation is realized in CrSBr-base…
Correlated magnetism of moiré exciton-polaritons on a triangular electron-spin lattice
Johannes Scherzer, Lukas Lackner, Bo Han +13
We demonstrate evidence of correlated magnetism for exciton-polaritons in a MoSe/WS moiré heterostructure with near-parallel alignment subject to electron doping. In ou…
Cavity-enhanced photon indistinguishability at room temperature and telecom wavelengths
Lukas Husel, Julian Trapp, Johannes Scherzer +10
Indistinguishable single photons in the telecom-bandwidth of optical fibers are indispensable for long-distance quantum communication. Solid-state single photon emitters have achie…
Hybrid moiré excitons and trions in twisted MoTe-MoSe heterobilayers
Shen Zhao, Xin Huang, Roland Gillen +8
We report experimental and theoretical studies of MoTe-MoSe heterobilayers with rigid moiré superlattices controlled by the twist angle. Using an effective continuum model…
Doping-control of excitons and magnetism in few-layer CrSBr
Farsane Tabataba-Vakili, Huy P. G. Nguyen, Anna Rupp +9
Magnetism in two-dimensional materials reveals phenomena distinct from bulk magnetic crystals, with sensitivity to charge doping and electric fields in monolayer and bilayer van de…
Exciton-exciton interactions in van der Waals heterobilayers
Alexander Steinhoff, Edith Wietek, Matthias Florian +7
Exciton-exciton interactions are key to understanding non-linear optical and transport phenomena in van der Waals heterobilayers, which emerged as versatile platforms to study corr…
Imaging lattice reconstruction in homobilayers and heterobilayers of transition metal dichalcogenides
Anna Rupp, Jonas Göser, Zhijie Li +3
Moiré interference effects have profound impact on the optoelectronic properties of vertical van der Waals structures. Here we establish secondary electron imaging in a scanning el…
Non-linear and negative effective diffusivity of optical excitations in moiré-free heterobilayers
Edith Wietek, Matthias Florian, Jonas M. Göser +6
Interlayer exciton diffusion is studied in atomically-reconstructed MoSe2/WSe2 heterobilayers with suppressed disorder. Local atomic registry is confirmed by characteristic optical…
Field-induced hybridization of moiré excitons in MoSe/WS heterobilayers
Borislav Polovnikov, Johannes Scherzer, Subhradeep Misra +10
We study experimentally and theoretically the hybridization among intralayer and interlayer moiré excitons in a MoSe/WS heterostructure with antiparallel alignment. Using a…
Ultra-Sensitive Extinction Measurements of Optically Active Defects in Monolayer MoS
Florian Sigger, Ines Amersdorffer, Alexander Hötger +12
We utilize cavity-enhanced extinction spectroscopy to directly quantify the optical absorption of defects in MoS generated by helium ion bombardment. We achieve hyperspectral i…
Lattice reconstruction in MoSe-WSe heterobilayers synthesized by chemical vapor deposition
Zhijie Li, Farsane Tabataba-Vakili, Shen Zhao +11
Vertical van der Waals heterostructures of semiconducting transition metal dichalcogenides realize moiré systems with rich correlated electron phases and moiré exciton phenomena. F…
Coulomb-correlated states of moiré excitons and charges in a semiconductor moiré lattice
Borislav Polovnikov, Johannes Scherzer, Subhradeep Misra +10
Semiconductor moiré heterostructures exhibit rich correlation-induced many-body phenomena with signatures of emergent magnetism, Mott insulating states or generalized Wigner crysta…
Excitons in mesoscopically reconstructed moiré heterostructures
Shen Zhao, Zhijie Li, Xin Huang +9
Moiré effects in twisted or lattice-incommensurate vertical assemblies of two-dimensional crystals give rise to a new class of quantum materials with rich transport and optical phe…
Energy dispersive X-ray spectroscopy of atomically thin semiconductors
Anna Rupp, Jonas Göser, Zhijie Li +3
We report the implementation of energy dispersive X-ray spectroscopy for layered semiconductors in the form of atomically thin transition metal dichalcogenides. The technique is ba…
Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2
Victor Funk, Koloman Wagner, Edith Wietek +8
We report an experimental study of temperature-dependent spectral lineshapes of phonon side-band emission stemming from dark excitons in monolayer and bilayer WSe. Using phot…
Valley-selective energy transfer between quantum dots in atomically thin semiconductors
Anvar S. Baimuratov, Alexander Högele
In monolayers of transition metal dichalcogenides the nonlocal nature of the effective dielectric screening leads to large binding energies of excitons. Additional lateral confinem…
Signatures of defect-localized charged excitons in the photoluminescence of monolayer molybdenum disulfide
Andre Neumann, Jessica Lindlau, Manuel Nutz +3
We study spatial photoluminescence characteristics of neutral and charged excitons across extended monolayer MoS synthesized by chemical vapor deposition. Using two-dimensional…
Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures
Michael Förg, Léo Colombier, Robin K. Patel +5
Monolayer (ML) transition metal dichalcogenides (TMDs) integrated in optical microcavities host exciton-polaritons as a hallmark of the strong light-matter coupling regime. Analogo…
Identifying optical signatures of momentum-dark excitons in transition metal dichalcogenide monolayers
Jessica Lindlau, Cedric Robert, Victor Funk +12
Transition metal dichalcogenide (TMD) monolayers (MLs) exhibit rich photoluminescence spectra associated with interband optical transitions of direct-gap semiconductors. Upon absor…
Dipolar and charged localized excitons in carbon nanotubes
Jan T. Glückert, Lyudmyla Adamska, Wolfgang Schinner +4
We study both experimentally and theoretically the fundamental interplay of exciton localization and polarization in semiconducting single-walled carbon nanotubes. From Stark spect…
Contamination of polymethylmethacrylate by organic quantum emitters
Andre Neumann, Jessica Lindlau, Alexander Högele
We report the observation of ubiquitous contamination of polymethylmethacrylate by organic molecules with optical activity in the visible spectral range. Contamination sites of ind…