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Benoît Marie Joseph Deveaud

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Related publications (95)

Exciton-polariton Bose-Einstein condensation: advances and issues

Benoît Marie Joseph Deveaud, Stefan Kundermann, Konstantinos Lagoudakis

In this review, we present a comprehensive set of experimental results on microcavity-polariton Bose-Einstein Condensation (BEC), obtained within a close collaboration between Institut Neel, Grenoble, France and EPFL, Lausanne, Switzerland. First, we recal ...

Inderscience2010

Selective photoexcitation of confined exciton-polariton vortices

Benoît Marie Joseph Deveaud, François Morier-Genoud, Gaël Nardin, Konstantinos Lagoudakis, Barbara Pietka

We resonantly excite exciton-polariton states confined in cylindrical traps. Using a homodyne detection setup, we are able to image the phase and amplitude of the confined polariton states. We evidence the excitation of vortex states, carrying an integer a ...

2010

Dynamics of Long-Range Ordering in an Exciton-Polariton Condensate

Benoît Marie Joseph Deveaud, Gaël Nardin, Konstantinos Lagoudakis, Barbara Pietka

We report on time-resolved measurements of the first order spatial coherence in an exciton-polariton Bose-Einstein condensate. Long-range spatial coherence is found to set in right at the onset of stimulated scattering, on a picosecond time scale. The cohe ...

American Physical Society2009

Dynamics of trion formation in GaAs quantum wells

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

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

Probability density optical tomography of confined quasiparticles in a semiconductor microcavity

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Gaël Nardin, Ounsi El Daïf, Roland Cerna, Barbara Pietka

We present the optical tomography of the probability density of quasiparticles, the microcavity polaritons, confined in three dimensions by cylindrical traps. Collecting the photoluminescence emitted by the quasimodes under continuous nonresonant laser exc ...

AIP American Institute of Physics2009

Observation of Half Quantum Vortices in an Exciton-Polariton Condensate

Benoît Marie Joseph Deveaud, Konstantinos Lagoudakis

Singly quantized vortices have already been observed in many systems, including the superfluid helium, Bose-Einstein condensates of dilute atomic gases, and condensates of exciton-polaritons in the solid state. Two-dimensional superfluids carrying spin are ...

American Association for the Advancement of Science2009

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

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

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

Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities

Benoît Marie Joseph Deveaud, Konstantinos Lagoudakis, Barbara Pietka

Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on the time scale of the exciton life ...

2009

Electron localization by a donor in the vicinity of a basal stacking fault in GaN

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Jelena Ristic, Pierre Michel Corfdir

We study the effects of the vicinity between a shallow donor nucleus and an I1-type basal stacking fault (BSF) in GaN. We propose a numerical calculation, in the “effective potential” formalism, of energies and envelope functions of electrons submitted to ...

2009

Low-temperature time-resolved cathodoluminescence study of exciton dynamics involving basal stacking faults in a-plane GaN

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Denis Martin, Nicolas Grandjean, Tiankai Zhu, Jelena Ristic, Pierre Michel Corfdir

Time-resolved cathodoluminescence at 27 K has been performed on a-plane GaN grown by epitaxial lateral overgrowth. We detail the relaxation and recombination mechanisms of excitons [free or bound to neutral donors, or bound to I1-type basal stacking faults ...

AIP American Institute of Physics2009

Exciton localization on basal stacking faults in a-plane epitaxial lateral overgrown GaN grown by hydride vapor phase epitaxy

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Denis Martin, Jacques Levrat, Nicolas Grandjean, Tiankai Zhu, Jelena Ristic, Pierre Michel Corfdir

We present a detailed study of the luminescence at 3.42 eV usually observed in a-plane epitaxial lateral overgrowth (ELO) GaN grown by hydride vapor phase epitaxy on r-plane sapphire. This band is related to radiative recombination of excitons in a commonl ...

American Institute of Physics2009

Time-resolved spectroscopy on GaN nanocolumns grown by plasma assisted molecular beam epitaxy on Si substrates

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Jelena Ristic, Pierre Michel Corfdir

A detailed study of excitons in unstrained GaN nanocolumns grown by plasma assisted molecular beam epitaxy on silicon substrates is presented. The time-integrated and time-resolved photoluminescence spectra do not depend significantly on the (111) or (001) ...

American Institute of Physics2009

Enhancement of microcavity polariton relaxation under confinement

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

We experimentally investigate the relaxation of spatially confined microcavity polaritons. We measure the time- and energy-resolved photoluminescence under resonant excitation and in the low-density regime. In this way, we have access to the time evolution ...

2009

Nonlinear relaxation of zero-dimension-trapped microcavity polaritons

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Gaël Nardin, Ounsi El Daïf, Jean-Philippe Brantut

We study the emission properties of confined polariton states in shallow zero-dimensional traps under nonresonant excitation. We evidence several relaxation regimes. For slightly negative photon-exciton detuning, we observe a nonlinear increase of the emis ...

AIP American Institute of Physics2008

Second-order time correlations within a polariton Bose-Einstein condensate in a CdTe microcavity

Benoît Marie Joseph Deveaud

Second-order time correlations of polaritons have been measured across the condensation threshold in a CdTe microcavity. The onset of Bose-Einstein condensation is marked by the disappearance of photon bunching, demonstrating the transition from a thermal- ...

American Physical Society2008

Modeling of gain and phase dynamics in quantum dot amplifiers

Benoît Marie Joseph Deveaud, Marco Rossetti, Pablo Moreno

By means of an electron hole rate equation model we explain the phase dynamics of a quantum dot semiconductor optical amplifier and the appearance of different decay times observed in pump and probe experiments. The ultrafast hole relaxation leads to a fir ...

Springer US2008

Quantized Vortices in an Exciton-Polariton Condensate

Benoît Marie Joseph Deveaud, Konstantinos Lagoudakis

One of the most striking quantum effects in an interacting Bose gas at low temperature is superfluidity. First observed in liquid 4He, this phenomenon has been intensively studied in a variety of systems for its remarkable features such as the persistence ...

Nature Publishing Group2008

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

Benoît Marie Joseph Deveaud, Jean Berney, Marcia Portella Oberli

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

Resonant nonlinear studies of trapped 0D-microcavity polaritons

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Gaël Nardin, Ounsi El Daïf

We performed studies on microcavity polaritons trapped along the three dimensions of space, under resonant excitation on a confined lower polariton state. We observed various nonlinear behaviors as a function of the pump power, without any apparent loss of ...

WILEY-VCH Verlag2008

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