Theory of the angle-resonant polariton amplifier

Ciuti, Cristiano; Schwendimann, P.; Deveaud, B.; Quattropani, A.

doi:10.1103/physrevb.62.r4825

Cited by 336 publications

(381 citation statements)

References 15 publications

Supporting

Mentioning

341

Contrasting

Unclassified

Order By: Relevance

“…Resonant non-linear effects have been investigated in experiment 3-5 and in theory [6][7][8] . It has been shown that for resonant excitation the experiments may be understood in terms of parametric processes (parametric amplification and oscillation) both in a pump and probe configuration and in a configuration in which only the resonant pump is present.…”

Section: Introductionmentioning

confidence: 99%

Amplification and quantum statistics of microcavity polaritons under nonresonant excitation

Schwendimann

Quattropani

2006

Phys. Rev. B

View full text Add to dashboard Cite

A model describing amplification and quantum statistics of the exciton polaritons with k = 0 in a non-resonantly excited semiconductor quantum well embedded in a microcavity is presented. Exploiting the bottleneck effect for exciton polaritons, it is assumed that the polaritons with k ≠ 0 act as a reservoir. The time evolution of the k = 0 polaritons is described by a master equation, in which two-and one-polariton transitions between the mode with k = 0 and the reservoir are accounted for. The k = 0 mode exhibits a threshold depending on the material parameters and on the injected exciton density. Below threshold the quantum statistics of the emission is characteristic of an incoherent process, while above threshold it approaches that of a laser.71.36.+c, 73.21.Fg I INTRODUCTIONIn the last few years, non-linear scattering between exciton polaritons has been observed in semiconductor quantum wells embedded in microcavities under resonant as well as non-resonant excitation 1, 2 . Resonant non-linear effects have been investigated in experiment 3-5 and in theory [6][7][8] . It has been shown that for resonant excitation the experiments may be understood in terms of parametric processes (parametric amplification and oscillation) both in a pump and probe configuration and in a configuration in which only the resonant pump is present. It has been also shown that a spontaneous transition from an incoherent emission regime to a coherent one occurs under resonant excitation 9,10 The emission under non-resonant excitation has also been investigated in experiments. As early as 1998 it has been shown that an amplification regime is present in a CdTe quantum well when the non-resonant pump energy is sufficiently large 11 . The amplified emission is observed in correspondence to the polariton mode with k=0. It has also been shown 12, 13 that the amplification is obtained in the strong coupling regime. In more recent years other characteristics of this amplification effect have been investigated experimentally. In particular, the onset of a transition from incoherent to coherent emission has been demonstrated 14 and the quantum statistics of the emitted radiation has been measured 15,16 . This transition has analogies with the transition characterizing the onset of laser action. Furthermore, some exciting results on the spatial coherence of the emission have been recently published 17 . However, in spite of the large number of existing experimental results, the theoretical investigation of the non-resonant amplified emission is still in progress. The theoretical description of the amplification process has to reproduce the threshold effect observed in the experiments and has to allow calculating the photon statistics of the emitted radiation i.e. the quantum polariton statistics. It should include both the exciton-phonon interaction that is responsible for the energy losses of the excitons generated by non-resonant pumping as well as the exciton-photon and the excitonexciton interaction leading to the formation of a macroscop...

show abstract

Section: Introductionmentioning

confidence: 99%

Amplification and quantum statistics of microcavity polaritons under nonresonant excitation

Schwendimann

Quattropani

2006

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…In Fig. 2a (black curve), the polariton energy redshift increases according to the fourth power of the excitonic Hopfield coefficient 23,25 . The experimental results, however, strongly deviate from this behaviour when the biexciton resonance is approached.…”

mentioning

confidence: 99%

Polaritonic Feshbach resonance

et al. 2014

Self Cite

View full text Add to dashboard Cite

A Feshbach resonance occurs when the energy of two interacting free particles comes into resonance with a molecular bound state. When approaching this resonance, marked changes in the interaction strength between the particles can arise. Feshbach resonances provide a powerful tool for controlling the interactions in ultracold atomic gases, which can be switched from repulsive to attractive [1][2][3][4] , and have allowed a range of many-body quantum physics e ects to be explored 5,6 . Here we demonstrate a Feshbach resonance based on the polariton spinor interactions in a semiconductor microcavity. By tuning the energy of two polaritons with anti-parallel spins across the biexciton bound state energy, we show an enhancement of attractive interactions and a prompt change to repulsive interactions. A mean-field two-channel model quantitatively reproduces the experimental results. This observation paves the way for a new tool for tuning polariton interactions and to move forward into quantum correlated polariton physics.A semiconductor microcavity is a unique system where exciton-polaritons emerge from the strong coupling between an exciton and a photon. The demonstration of Bose-Einstein condensation of exciton-polaritons in a semiconductor microcavity 7 has attracted much attention and opened a wide field of research on polariton quantum fluids, such as superfluidity 8 , quantum vortices 9 and Bogoliubov dispersion [10][11][12] . Many more examples could be proposed to highlight the fact that polaritons provide a concrete realization of a bosonic interacting many-body quantum system, complementing the work performed on ultracold atom systems.Furthermore, polaritons exhibit a polarization degree of freedom, with a one-to-one connection to two counter circular polarizations for their photonic part. The different excitonic content of both polarization states results in asymmetric spinor interactions. Such spinor interactions offer a wide range of effects and a very rich physics to explore in semiconductor microcavities [13][14][15][16][17][18] .In this work, we demonstrate a Feshbach resonance in a polariton semiconductor microcavity. Feshbach biexcitonic resonant scattering is investigated through spectrally resolved circularly polarized pump-probe spectroscopy on a III-V based microcavity (Methods). To bring the energy of a two-lower polariton state into resonance with the biexciton state we change the cavity exciton detuning (Fig. 1a,c). We evidence the resonant polariton scattering by probing the anti-parallel spin polariton interactions when scanning the two-polariton energy across the bound biexciton state. We clearly show the enhancement of polariton interactions and the change of their character from attractive to repulsive. Moreover, we observe a decrease of the polariton resonance amplitude when the lower polariton energy is in the vicinity of the biexciton energy. The results are modelled by numerical simulations based on a meanfield two-channel model that includes coupling between polaritons and biexcito...

show abstract

“…One of the most spectacular and still controversial effects is the possibility to get Bose Eintein Condensation of polaritons in quantum wells embedded in semiconductor microcavities. The accumulation in the ground state of polaritons has been suggested by different experiments 1,2,3,4 and predicted theoretically by 5,6,7 . By illuminating the sample with lasers of different frequencies, it is possible to get a matter-wave amplification without requiring a coherent pumplaser 8,9 However, one of the main difficulties to obtain a Bose condensation of polaritons has been the relaxation of the bottleneck which hinders that excitons relax quickly to the optically active lower energy states.…”

Section: Introductionmentioning

confidence: 81%

Time resolved scattering relaxation mechanisms of microcavity polaritons

Chaves¹,

Rodríguez²

2005

Solid State Communications

View full text Add to dashboard Cite

We study the polariton relaxation dynamics for different scattering mechanisms as: Phonon and electron scattering procesess. The relaxation polariton is obtained at very short times by solving the Boltzman equation. Instead of the well-known relaxation process by phonons, we show that the bottleneck effect relaxes to the ground state more efficiently at low pump power intensity when the electron relaxation process is included. In this way, we clearly demonstrate that different relaxation times exist, for which any of these two mechanism is more efficient to relax the polariton population to the ground state.

show abstract

Theory of the angle-resonant polariton amplifier

Cited by 336 publications

References 15 publications

Amplification and quantum statistics of microcavity polaritons under nonresonant excitation

Amplification and quantum statistics of microcavity polaritons under nonresonant excitation

Polaritonic Feshbach resonance

Time resolved scattering relaxation mechanisms of microcavity polaritons

Contact Info

Product

Resources

About