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

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

doi:10.1103/physrevb.95.205303

Cited by 30 publications

(37 citation statements)

References 67 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.…”

supporting

confidence: 89%

“…We can of course also obtain even better agreement with the experimental results Ref. [24] if we use different values of E B and γ B , although this makes little physical sense. To illustrate this, we plot as a dashed black curve in the lower panel the theoretical prediction for the lower ↓ polariton using E B = −1.4meV and γ B = 1.28meV, which agrees well with the experimental results.…”

mentioning

confidence: 65%

“…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%

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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%

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confidence: 65%

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Strong interactions and biexcitons in a polariton mixture

et al. 2019

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“…Implications for experiments.-As previously mentioned, the pump-probe protocol employed in the experiments by Takemura et al [32,33] is similar to our impurity scenario. However, Ref.…”

supporting

confidence: 62%

Spectroscopic Signatures of Quantum Many-Body Correlations in Polariton Microcavities

Levinsen

Marchetti²,

Keeling³

et al. 2019

Phys. Rev. Lett.

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We investigate the many-body states of exciton-polaritons that can be observed by pump-probe spectroscopy. Here, a weak-probe "spin-down" polariton is introduced into a coherent state of "spin-up" polaritons created by a strong pump. We show that the ↓ impurities become dressed by excitations of the ↑ medium, and form new polaronic quasiparticles that feature two-point and threepoint many-body quantum correlations, which, in the low density regime, arise from coupling to the vacuum biexciton and triexciton states respectively. In particular, we find that these correlations generate additional branches and avoided crossings in the ↓ optical transmission spectrum that have a characteristic dependence on the ↑-polariton density. Our results thus demonstrate a way to directly observe correlated many-body states in an exciton-polariton system that go beyond classical mean-field theories. arXiv:1806.10835v1 [cond-mat.quant-gas]

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“…5, with parameters are chosen in consistence with Ref. 46 . In this limiting case of adiabatic approximation broken, we find that not only the vortex lattices disappear, but the polariton condensates decompose as well.…”

Section: The Evolutions Of the Density Distribution [Figs 3 (A) And mentioning

confidence: 99%

Emergence and stability of spontaneous vortex lattices in exciton-polariton condensates

et al. 2019

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The spontaneous formation of lattice structure of quantized vortices is a characteristic feature of superfluidity in closed systems under thermal equilibrium. In exciton-polariton Bose-Einstein condensate, which is a typical example of macroscopic quantum state in open systems, spontaneous vortex lattices have also been proposed by not yet observed. Here, we take into account the finite decay rate of exciton reservoir, and theoretically investigate the vortex structures in circularly pumped polariton Bose-Einstein condensate. Our results show that a decreasing reservoir decay rate can reduce the number of vortices and destabilize the lattice structure, hence is unfavorable to the formation and observation of vortex lattices. These detrimental effects can be prevailed by applying an external angular momentum.

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

Cited by 30 publications

References 67 publications

Strong interactions and biexcitons in a polariton mixture

Strong interactions and biexcitons in a polariton mixture

Spectroscopic Signatures of Quantum Many-Body Correlations in Polariton Microcavities

Emergence and stability of spontaneous vortex lattices in exciton-polariton condensates

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