Tuning intraband and interband transition rates via excitonic correlation in low-dimensional semiconductors
Scholar | Other documents of the author: Planelles Fuster, Josep; Achtstein, Alexander W.; Scott, Riccardo; Owschimikow, Nina; Woggon, Ulrike; Climente, Juan I.
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TitleTuning intraband and interband transition rates via excitonic correlation in low-dimensional semiconductors
We show that electron-hole correlation can be used to tune interband and intra- band optical transition rates in semiconductor nanostructures with at least one weakly confined direction. The valence-to-conduction ... [+]
We show that electron-hole correlation can be used to tune interband and intra- band optical transition rates in semiconductor nanostructures with at least one weakly confined direction. The valence-to-conduction band transition rate can be enhanced by a factor (L/aB) N – with L the length of the weakly confined direction, aB the exciton Bohr radius and N the dimensionality of the nanostructure – while the rate of intraband and inter-valence-band transitions can be slowed down by the inverse factor, (aB/L) N . Adding a hitherto underexplored degree of freedom to engineer excitonic transition rates, this size dependence is of interest for various opto-electronic applica- tions. It also offers an interpretation of the superlinear volume scaling of two-photon absorption (TPA) cross-section recently reported for CdSe nanoplatelets, thus laying foundations to obtain unprecedented TPA cross sections, well above those of conven- tional two-photon absorbers. Further, our concept explains the background of the validity of the universal continuum absorption approach for the determination of par- ticle concentrations via the intrinsic absorption. Potential applications of our approach include low excitation intensity confocal two-photon imaging, two-photon autocorre- lation and cross correlation with much higher sensitivity and unprecedented temporal resolution as well as TPA based optical stabilization and optimizing of inter-subband transition rates in quantum cascade lasers. [-]
Investigation projectMINECO project CTQ2017-83781-P; UJI project B2017-59; R.S., N.O., U.W. and A.W.A acknowledge DFG grants WO477-1/32 and AC290-1/1 and 2/1.
Bibliographic citationPlanelles, J., Achtstein, A., Scott, R., Owschimikow, N., Woggon, U., Climente, Juan I. Tuning Intraband and Interband Transition Rates via Excitonic Correlation in Low-Dimensional Semiconductors. ACS Photonics Article ASAP DOI: 10.1021/acsphotonics.8b00689
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