Sommaire:

Elementary excitations in dense media are renormalized by their mutual interaction, giving rise to quasiparticles with new collective properties. This renormalization has been observed in highly doped semiconductor quantum wells: Coulomb interaction ties together all the electronic excitations between confined states into a unique bright collective mode, a confined plasmon [1]. We have shown that confined plasmons have a superradiant nature: their spontaneous emission rate is proportional to the number of particles taking part in the collective excitation. This property has been experimentally demonstrated by performing emission spectra under electrical excitation, showing that spontaneous emission can be the dominant relaxation mechanism of plasmons [2].
In this talk I will discuss the possibility of exploiting the superradiant nature of confined plasmons to tailor the light-matter interaction in a doped quantum well [3] and realize novel quantum optoelectronic devices, such as directional and quasi-monochromatic incandescent sources [4]. I will also present devices based on spatially separated plasmons interacting through the electromagnetic field, resulting in Dicke superradiance and cooperative Lamb shift [5].

[1] A. Delteil et al., Phys. Rev. Lett. 109, 246808 (2012).
[2] T. Laurent et al., Phys. Rev. Lett. 115, 187402 (2015).
[3] S. Huppert et al., Phys. Rev. B 94, 155418 (2016).
[4] S. Huppert et al., ACS Photonics 2, 1663 (2015).
[6] G. Frucci et al., New Journal of Physics 19, 043006 (2017).

Pour plus d'informations, merci de contacter Antezza M.