Publications by Davide Sarchi | EPFL Graph Search

Stationary and time-dependent correlations in polariton condensates

Antonio Quattropani, Paolo Schwendimann, Davide Sarchi

The statistics of the condensed polaritons is described in terms of the Wigner function. In the framework of the truncated Wigner method, the Wigner function obeys a Fokker-Planck equation, which is solved analytically. The second-order correlations in the ...

2010

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

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

Spectrum and thermal fluctuations of a microcavity polariton Bose-Einstein condensate

Vincenzo Savona, Davide Sarchi

The Hartree-Fock-Popov theory of interacting Bose particles is developed, for modeling exciton-polaritons in semiconductor microcavities undergoing Bose-Einstein condensation. A self-consistent treatment of the linear exciton-photon coupling and of the exc ...

2008

Coherent dynamics and parametric instabilities of microcavity polaritons in double-well systems

Vincenzo Savona, Davide Sarchi

We investigate the physics of coherent polaritons in a double-well configuration under a resonant pumping. For a continuous-wave pump, bistability and self-pulsing regimes are identified as a function of the pump energy and intensity. The response to an ad ...

2008

Effects of noise in different approaches for the statistics of polariton condensates

Antonio Quattropani, Paolo Schwendimann, Davide Sarchi

The second-order correlation function of the polariton condensate is calculated within two different approaches. Both approaches qualitatively reproduce the deviations from the full coherence of the second-order correlation function that have been observed ...

2008

Towards thermal equilibrium in the Bose-Einstein condensation of microcavity polaritons

Vincenzo Savona, Davide Sarchi

By comparing a kinetic and a thermal-equilibrium theory of polariton Bose-Einstein condensation, we study under what conditions the dynamical condensation under steady-state non-resonant pumping can approach thermal equilibrium. In particular, we study the ...

2007

Long-range order in the Bose-Einstein condensation of polaritons

Vincenzo Savona, Davide Sarchi

We adopt a kinetic theory of polariton nonequilibrium Bose-Einstein condensation to describe the formation of off-diagonal long-range order. The theory accounts properly for the dominant role of quantum fluctuations in the condensate. In realistic situatio ...

2007

Bose-Einstein condensation of microcavity polaritons

Davide Sarchi

This thesis presents a theoretical description of the phase transition, with formation of long-range spatial coherence, occurring in a gas of exciton-polaritons in a semiconductor microcavity structure. The results and predictions of the theories developed ...

EPFL2007