Montes Bajo, Miguel
Ulloa, Jose M.
Le Biavan, Nolwenn
Julien, François H.
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
Intersubband (ISB) transitions are of high significance for light-emitting and light-detecting devices in the infrared and, when involving large electron densities, for plasmonics and strong light-matter coupling physics. Here it is observed that the simultaneously occurring fundamental and excited-state ISB transitions in highly-doped, m-plane ZnO/MgxZn1−xO multiple quantum wells, couple into a single collective oscillation: the multisubband plasmon (MSP). With 2D electron densities up to 4×1013cm−2, an outstanding regime is reached in which the observed MSP frequency is three times larger than that of the fundamental ISB transition as a result of depolarization. This effect is analyzed using a dielectric tensor for ZnO including the interaction of the light with the lattice, the in-plane free electrons, and the off-plane MSP. The impact of the broadening of the MSP and its interaction with phonons is discussed. The results presented here show the potential of ZnO/MgxZn1−xO for infrared optoelectronic applications, which can be extended to the THz range with appropriate design of the quantum wells. Show more
Journal / seriesPhysical Review Applied
Pages / Article No.
PublisherAmerican Physical Society
Organisational unit03759 - Faist, Jérôme / Faist, Jérôme
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