Polaritonic Cross Feshbach Resonance

Navadeh-Toupchi, M.; Takemura, Naotomo; Oberli, D. Y.; Portella‐Oberli, M. T.

doi:10.1103/physrevlett.122.047402

Cited by 27 publications

(32 citation statements)

References 43 publications

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“…Our theory is minimal in the sense that it contains precisely the terms necessary to describe Feshbach interactions due to the formation of a bi-exciton. We show that it recovers the main results of the two recent experiments probing energy shifts in polariton mixtures [24,25], supporting that a Feshbach mediated interaction was indeed observed. Moreover, we extract both the energy and decay rate of the bi-exciton state from the experimental data, and predict that the latter is much larger than can be explained from the splitting of the bi-exciton into two unbound polaritons.…”

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confidence: 89%

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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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confidence: 89%

“…where δ k = ε c k −ε x k is the momentum dependent detuning. In accordance with the experiments, we assume that the pump beam creates a BEC of ↑ lower polaritons in the k = 0 state with density n LP ↑ [24,25]. Diagrammatic approach.-Our focus is on Feshbach mediated interaction effects on the ↓ polaritons.…”

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confidence: 99%

Strong interactions and biexcitons in a polariton mixture

et al. 2019

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“…This allows us to probe and control the coherence properties of the quasiparticles. Our results pave the way for transferring the knowledge regarding the ultrafast dynamics of condensed matter systems [79][80][81][82] to the ultracold atomic realm.…”

Section: Introductionmentioning

confidence: 76%

Pump-probe spectroscopy of Bose polarons: Dynamical formation and coherence

Mistakidis

Katsimiga

Koutentakis³

et al. 2020

Phys. Rev. Research

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We propose and investigate a pump-probe spectroscopy scheme to unveil the time-resolved dynamics of fermionic or bosonic impurities immersed in a harmonically trapped Bose-Einstein condensate. In this scheme a pump pulse initially transfers the impurities from a noninteracting to a resonantly interacting spin state and, after a finite time in which the system evolves freely, the probe pulse reverses this transition. This directly allows us to monitor the nonequilibrium dynamics of the impurities as the dynamical formation of coherent attractive or repulsive Bose polarons and signatures of their induced interactions are imprinted in the probe spectra. We show that for interspecies repulsions exceeding the intraspecies ones a temporal orthogonality catastrophe occurs, followed by enhanced energy redistribution processes, independently of the impurity's flavor. This phenomenon takes place over the characteristic trap timescales. For much longer timescales a steady state is reached characterized by substantial losses of coherence of the impurities. This steady state is related to eigenstate thermalization and it is demonstrated to be independent of the system's characteristics.

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“…1, the variables and coefficients are dimensionless by using the time scale τ 1/Γ c and the length scale of the diffraction length of polariton matter wave L Z/(m p Γ c ) , where m p is the effective mass of polariton and Γ c is the decay rate of coherent polaritons in physical units [22]. According to the typical parameters of a GaAs-based microcavity, we use the dimensionless parameters c R 2, R R 0.1, g c 0.001, g R 0.01, and G 0.01 [32,34] in Eq. 1 to numerically simulate the dynamics of polariton BEC by a time-splitting Fourier pseudospectral method.…”

Section: Theoretical Modelmentioning

confidence: 99%

Spontaneous Formations of Dynamical Steady States in Polariton Condensates

Niu

Zhang

2021

Front. Phys.

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We present a numerical analysis on dynamical steady states of polariton Bose–Einstein condensates (BECs) in an incoherent exciton reservoir driven by a ring-shaped optical pump. The balance between the loss and gain of polariton BEC induces a variety of steady states with different configurations, including approximate Gaussian distribution and topological defects, such as vortex–antivortex pairs, vortices with a winding number, and solitons. Besides, the system becomes unstable under fast decay rates and small pumping ring, where BECs can no longer exist in the long-time limit. We also confirm the soliton is dynamically stable in this system, with a steady polariton current induced by the repulsive polariton–polariton and polariton–exciton interactions.

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Polaritonic Cross Feshbach Resonance

Cited by 27 publications

References 43 publications

Strong interactions and biexcitons in a polariton mixture

Strong interactions and biexcitons in a polariton mixture

Pump-probe spectroscopy of Bose polarons: Dynamical formation and coherence

Spontaneous Formations of Dynamical Steady States in Polariton Condensates

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