Koloman Wagner
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View article: Electron recoil effect in electrically tunable MoSe2 monolayers
Electron recoil effect in electrically tunable MoSe2 monolayers Open
Radiative recombination of excitons dressed by the interactions with free charge carriers often occurs under simultaneous excitation of either electrons or holes to unbound states. This phenomenon, known as the electron recoil effect, mani…
View article: Spectral asymmetry of phonon sideband luminescence in monolayer and\n bilayer WSe2
Spectral asymmetry of phonon sideband luminescence in monolayer and\n bilayer WSe2 Open
We report an experimental study of temperature-dependent spectral lineshapes\nof phonon side-band emission stemming from dark excitons in monolayer and\nbilayer WSe$_{2}$. Using photoluminescence spectroscopy in the range from 4 to\n100K, …
View article: Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2
Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2 Open
We report an experimental study of temperature-dependent spectral lineshapes of phonon side-band emission stemming from dark excitons in monolayer and bilayer WSe$_{2}$. Using photoluminescence spectroscopy in the range from 4 to 100K, we …
View article: Dark exciton-exciton annihilation in monolayer transition-metal dichalcogenides
Dark exciton-exciton annihilation in monolayer transition-metal dichalcogenides Open
The exceptionally strong Coulomb interaction in semiconducting transition-metal dichalcogenides (TMDs) gives rise to a rich exciton landscape consisting of bright and dark exciton states. At elevated densities, excitons can interact throug…
View article: Non-equilibrium diffusion of dark excitons in atomically thin semiconductors
Non-equilibrium diffusion of dark excitons in atomically thin semiconductors Open
Combining microscopic theory and spatiotemporal photoluminescence experiments we reveal an unconventional, time-dependent exciton diffusion in atomically thin semiconductors. This behavior originates from hot dark excitons with large exces…
View article: Temporal Evolution of Low-Temperature Phonon Sidebands in Transition Metal Dichalcogenides
Temporal Evolution of Low-Temperature Phonon Sidebands in Transition Metal Dichalcogenides Open
Low-temperature photoluminescence (PL) of hBN-encapsulated monolayer tungsten diselenide (WSe2) shows a multitude of sharp emission peaks below the bright exciton. Some of them have been recently identified as phonon sidebands of momentum-…