Marcia Portella Oberli

Cette personne n’est plus à l’EPFL

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Publications associées (25)

Spatial dynamics of confined semiconductor microcavity polaritons

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Taofiq Paraïso, Roland Cerna

We report on the dynamics of confined zero-dimensional polaritons. We excite resonantly discrete polariton states optically with a tailored picosecond laser pulse and observe their emission time resolved in the two-dimensional k space or real space. We are ...

2010

Dynamics of trion formation in GaAs quantum wells

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Jean Berney, Lars Kappei

We show a double path mechanism for the formation of charged excitons (trions); they are formed through bi- and trimolecular processes. This directly implies that both negatively and positively charged excitons coexist in a quantum well, even in the absenc ...

2009

Coherent optical control of the wave function of zero dimensional exciton polaritons

Benoît Marie Joseph Deveaud, Vincenzo Savona, François Morier-Genoud, Marcia Portella Oberli, Gaël Nardin, Barbara Pietka, Taofiq Paraïso, Ounsi El Daïf, Davide Sarchi, Roland Cerna

Control of the wave function of confined microcavity polaritons is demonstrated experimentally and theoretically by means of tailored resonant optical excitation. Three dimensional confinement is achieved by etching mesas on top of the microcavity spacer l ...

2009

Dressed excitons within an incoherent electron gas: Observation of a Mollow triplet and an Autler-Townes doublet

Benoît Marie Joseph Deveaud, Marcia Portella Oberli, Jean Berney

We demonstrate that the interaction between excitons and a sea of incoherent electrons does not preclude excitons dressing by light. We investigate if exciton-electron scattering plays some inhibiting role in the coherent light-exciton coupling by measurin ...

2008

Intraband carrier photoexcitation in quantum dot lasers

Benoît Marie Joseph Deveaud, Marcia Portella Oberli

We unveil the role of bound-to-continuum photoexcitation of carriers as a relevant process that affects the performance of quantum dot (OD) lasers. We present the response of an InAs/InGaAs QD laser to a sub-band gap pump, showing an unexpected depletion o ...

American Chemical Society2008

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