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A quantum fluid passing an obstacle behaves differently from a classical one. When the flow is slow enough, the quantum gas enters a superfluid regime, and neither whirlpools nor waves form around the obstacle. For higher flow velocities, it has been predicted that the perturbation induced by the defect gives rise to the turbulent emission of quantized… (More)

- Y Castin, R Dum, E Mandonnet, A Minguzzi, I Carusotto
- 2000

We investigate the coherence properties of an atomic beam evaporatively cooled in a magnetic guide, assuming thermal equilibrium in the quantum degenerate regime. The gas experiences two-dimensional, transverse Bose-Einstein condensation rather than a full three-dimensional condensation because of the very elongated geometry of the magnetic guide. First… (More)

- Michiel Wouters, Iacopo Carusotto
- Physical review letters
- 2007

We develop a mean-field theory of the dynamics of a nonequilibrium Bose-Einstein condensate of exciton polaritons in a semiconductor microcavity. The spectrum of elementary excitations around the stationary state is analytically studied by means of a generalized Gross-Pitaevskii equation. A diffusive behavior of the Goldstone mode is found in the spatially… (More)

- Iacopo Carusotto, Cristiano Ciuti
- Physical review letters
- 2004

We study the motion of a polariton fluid injected into a planar microcavity by a continuous wave laser. In the presence of static defects, the spectrum of the Bogoliubov-like excitations reflects onto the shape and intensity of the resonant Rayleigh scattering emission pattern in both momentum and real space. We find a superfluid regime in which the… (More)

- C Latta, A Högele, +10 authors A Imamoglu
- 2009

Resonant laser scattering along with photon correlation measurements established the atom-like character of quantum dots. Here, we show that for a wide range of experimental parameters it is impossible to isolate elementary quantum-dot excitations from a strong influence of nuclear spins; the absorption lineshapes at magnetic fields exceeding 1 T indicate… (More)

- Tung-Lam Dao, Antoine Georges, Jean Dalibard, Christophe Salomon, Iacopo Carusotto
- Physical review letters
- 2007

We propose a Raman spectroscopy technique which is able to probe the one-particle Green function, the Fermi surface, and the quasiparticles of a gas of strongly interacting ultracold atoms. We give quantitative examples of experimentally accessible spectra. The efficiency of the method is validated by means of simulated images for the case of a usual Fermi… (More)

- Simone De Liberato, Cristiano Ciuti, Iacopo Carusotto
- Physical review letters
- 2007

We develop a general theory of the quantum vacuum radiation generated by an arbitrary time modulation of the vacuum Rabi frequency of an intersubband transition in a doped quantum well system embedded in a planar microcavity. Both nonradiative and radiative losses are included within an input-output quantum Langevin framework. The intensity and the spectral… (More)

- Zeno Gaburro, Mher Ghulinyan, Francesco Riboli, Lorenzo Pavesi, Alessio Recati, Iacopo Carusotto
- Optics express
- 2006

We propose a time-dependent, spatially periodic photonic structure which is able to shift the carrier frequency of an optical pulse which propagates through it. Taking advantage of the slow group velocity of light in periodic photonic structures, the wavelength conversion process can be performed with an efficiency close to 1 and without affecting the shape… (More)

- T Jacqmin, I Carusotto, +7 authors A Amo
- Physical review letters
- 2014

Two-dimensional lattices of coupled micropillars etched in a planar semiconductor microcavity offer a workbench to engineer the band structure of polaritons. We report experimental studies of honeycomb lattices where the polariton low-energy dispersion is analogous to that of electrons in graphene. Using energy-resolved photoluminescence, we directly… (More)

We study the electromagnetic force exerted on a pair of parallel slab waveguides by the light propagating through them. The dependence of the force on the separation of the slabs is calculated by means of the Maxwell–Stress tensor formalism and its main features are discussed for the different modes of the radiation. Spatially symmetric (antisymmetric)… (More)