Philipp Nagler

TL;DR: By engineering the surrounding dielectric environment, one can tune the electronic bandgap and the exciton binding energy in monolayers of WS2 and WSe2 by hundreds of meV, as an initial step towards the creation of diverse lateral junctions with nanoscale resolution.

TL;DR: It is shown that the excitonic coherence lifetime is determined by phonon-induced intravalley scattering and intervalley scattering into dark exciton states, and in particular, in WS2, exciton relaxation processes involving phonon emission into lower-lying dark states that are operative at all temperatures.

TL;DR: In this article, the 1s-2p resonance of 1s A excitons in a single-layer WSe2 was analyzed and the decay dynamics of small-momentum exciton decay was shown to be ultrafast.

TL;DR: In photoluminescence and in energy-dependent Kerr rotation measurements, the authors are able to resolve two different trion states, which they interpret as intravalley and intervalley trions.

TL;DR: In this paper, temperature-dependent photoluminescence measurements on mechanically exfoliated single-layer WS2 are presented, revealing the existence of neutral and charged excitons at low temperatures as well as at room temperature.