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[Stage/Thèse] Theoretical modelling of superradiant emitters

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a post-doc position is available in Quantum Physics and Devices group at
University Paris Diderot.

The infrared optical response of a two-dimensional electron gas confined in a semiconductor quantum well is a cooperative phenomenon that gathers all the oscillator strength in one and only resonance, corresponding to a many-body excitation of the system, a two-dimensional plasmon [1]. This two-dimensional plasmon has a superradiant nature as its spontaneous emission lifetime depends on the number of electrons involved in the interaction and it can be even shorter than the typical non-radiative lifetime [2,3].
The possibility of exploiting this extremely short ( 100 fs) spontaneous emission lifetime is very appealing for the realisation of efficient light-emitting devices. The aim of this project will be to theoretically investigate how an electronic dc current can excite a confined plasmon, in order to realise very bright electromagnetic sources based on a quantum engineering of collective excitations rather than single electronic states.
We are looking for a highly motivated and creative young researcher, with a strong background in general concepts of solid-state and many-body physics. The post-doc will work at University Paris Diderot in close interaction with experimental researchers of the team Quantum Physics and Devices, and with researchers specialized in plasma physics at LSPM - University Paris Nord.
The position will be initially for one year, with the possibility of renewal for another year. The starting date is quite flexible, with a preference for fall 2017.
1. A. Delteil, A. Vasanelli, Y. Todorov, C. Feuillet-Palma, M. Renaudat St-Jean, G. Beaudoin, I. Sagnes and C. Sirtori, Charge induced coherence between intersubband plasmons in a quantum structure, Phys. Rev. Lett. 109, 246808 (2012).
2. T. Laurent, Y. Todorov, A. Vasanelli, A. Delteil, C. Sirtori, I. Sagnes, G. Beaudoin, Superradiant Emission from a Collective Excitation in a Semiconductor, Phys. Rev. Lett. 115, 187402 (2015).
3. S. Huppert, A. Vasanelli, G. Pegolotti, Y. Todorov, and C. Sirtori, Strong and ultrastrong coupling with free-space radiation, Phys. Rev. B 94, 155418 (2016).

Contact :
Prof. Angela Vasanelli
Laboratoire Matériaux et Phénomènes Quantiques
Université Paris Diderot