Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

Takemura, Naotomo; Biswas, S.; Navadeh-Toupchi, M.; Oberli, D. Y.; Portella‐Oberli, M. T.; Deveaud, B.

doi:10.1103/physrevb.94.195301

Cited by 12 publications

(12 citation statements)

References 28 publications

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“…3 A and C are due to dark-excitedstate population and occur after selective excitation of either polariton. The fact that response is qualitatively similar when exciting at the LP, UP, or even the dark-state frequency indicates that there are polariton-dark-state interactions that lead polaritonic excitations (either LP or UP) to transfer into dark states possibly via phonon scattering (26,27).…”

Section: Resultsmentioning

confidence: 98%

Two-dimensional infrared spectroscopy of vibrational polaritons

Xiang

Ribeiro

Dunkelberger

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

180

266

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We report experimental 2D infrared (2D IR) spectra of coherent light-matter excitations--molecular vibrational polaritons. The application of advanced 2D IR spectroscopy to vibrational polaritons challenges and advances our understanding in both fields. First, the 2D IR spectra of polaritons differ drastically from free uncoupled excitations and a new interpretation is needed. Second, 2D IR uniquely resolves excitation of hybrid light-matter polaritons and unexpected dark states in a state-selective manner, revealing otherwise hidden interactions between them. Moreover, 2D IR signals highlight the impact of molecular anharmonicities which are applicable to virtually all molecular systems. A quantum-mechanical model is developed which incorporates both nuclear and electrical anharmonicities and provides the basis for interpreting this class of 2D IR spectra. This work lays the foundation for investigating phenomena of nonlinear photonics and chemistry of molecular vibrational polaritons which cannot be probed with traditional linear spectroscopy.

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Section: Resultsmentioning

confidence: 98%

Two-dimensional infrared spectroscopy of vibrational polaritons

Xiang

Ribeiro

Dunkelberger

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

180

266

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“…The cause is that the model used here is fully coherent and neglects any long-lived population beyond the cavity lifetime. Inspired by previous works [19,49,50], we try to construct phenomenologically a set of coupled mode equations in-cluding an exciton reservoir:…”

Section: Discussionmentioning

confidence: 99%

“…where n R,↓ is the spin-down reservoir population and a long lifetime is assumed γ R = 0.01 meV [19]. Here we neglect the creation of a spin-up incoherent reservoir and a corresponding coherent population of polaritons, because the spin-up probe pulse is weak and, thus, contribute only by a small amount of spin-up excitons and polaritons to the incoherent reservoir and to the coherent population, respectively.…”

Section: Appendix A: Spinor Polariton Dynamicsmentioning

confidence: 99%

“…In this paper, however, the pump pulse is a spectrally narrow and excites only the lower polariton branch. This allows the use of the lower polariton basis in a theoretical model, which dramatically simplifies the analysis by removing complicated effects associated with the upper polariton branch such as an excitation induced dephasing (EID) [19]. We discuss a quasi-stationary behavior of the spinor polariton physics within the Bogoliubov theory and a mean-field two-channel model.…”

Section: Introductionmentioning

confidence: 99%

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Spin anisotropic interactions of lower polaritons in the vicinity of polaritonic Feshbach resonance

et al. 2017

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We determine experimentally the spinor interaction constants of lower polaritons α1 and α2 using a resonant pump-probe spectroscopy with a spectrally narrow pump pulse. Our experimental findings are analyzed with the Bogoliubov-type theory and a mean-field two channel model based on the lower polariton and biexciton basis. We find an enhancement of the attractive interaction and a dissipative non-linearity of lower polaritons with anti-parallel spins in the vicinity of the biexciton resonance when the energy of two lower polaritons approaches energetically that of the biexciton. These observations are consistent with the existence of a scattering resonance between lower polaritons and biexcitons (polaritonic Feshbach resonance).

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“…System.-We consider a two-dimensional (2D) mixture of polaritons in spin states σ = {↓, ↑}, resulting from the coupling of two quantum light fields with counter-circular polarizations to the excitonic modes of a 2D semiconductor microcavity [22][23][24][25]32]. The Hamiltonian is…”

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confidence: 99%

Strong interactions and biexcitons in a polariton mixture

et al. 2019

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We develop a many-body theory for the properties of exciton-polaritons interacting strongly with a Bose-Einstein condensate of exciton-polaritons in another spin state. Interactions lead to the presence of a two-body bound state, the bi-exciton, giving rise to a Feshbach resonance in the polariton spectrum when its energy is equal to that of two free polaritons. Using the minimal set of terms to describe this resonance, our theory recovers the main findings of two experiments probing interaction effects for upper and lower polaritons in a BEC respectively. This strongly supports that Feshbach physics has indeed been realized, and we furthermore extract the energy and decay of biexciton from the experimental data. The decay rate is predicted to be much larger than that coming from its dissociation into two free polaritons indicating that other decay channels are important. arXiv:1908.11607v1 [cond-mat.quant-gas]

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Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

Cited by 12 publications

References 28 publications

Two-dimensional infrared spectroscopy of vibrational polaritons

Two-dimensional infrared spectroscopy of vibrational polaritons

Spin anisotropic interactions of lower polaritons in the vicinity of polaritonic Feshbach resonance

Strong interactions and biexcitons in a polariton mixture

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