Two-dimensional semiconductors: Recent development

Modulation of Fano Resonance by a Perpendicular Electric Field in GaAs-AlAs Quantum Well

“…The decrease is much more significant for larger w. This behavior can be understood by the polarization of the E 1 electron and HH 1 hole along opposite directions which gives rise to a spatial separation between these carries [8]. Our results agree with that obtained by [7,9] and [13]. Fig.…”

Relation between photoreflectance excitation and absorption spectra for GaAs and GaN films

“…9,10 In the GaN film, the excitonic peaks are also more distinct in reported experimental absorption spectra 11,12 than in our PRE spectra. We therefore compare the measured PRE spectra to data in the literature for high-quality materials.…”

Exciton Cooling in 2D Perovskite Nanoplatelets: Rationalized Carrier-Induced Stark and Phonon Bottleneck Effects

“…On the other hand, an electric field perpendicular to the NPL plane should result in a red shift, , known as a quantum-confined Stark effect, with little variation on the exciton binding energy at low/moderate field value . These blue- (red-) shifts are characteristic of the effect of an electric field applied in (perpendicular to) the 2D plane of quantum wells, as typically observed in epitaxially grown nanostructures. , These two contributions are observed at the same time, as for a pump excitation well above the band-edge, there should not be any photoselection of a special dipole orientation. In other words, the excitation well above the bandgap generates dipoles with statistically random orientations.…”