Room temperature exciton–polariton condensate in an optically-controlled trap

Zhang, Xinhan; Zhang, Yingjun; Dong, Hongxing; Tang, Bing; Li, Dehui; Cui, Tian Shu; Xu, Chi; Zhou, Weihang

doi:10.1039/c8nr08839j

Cited by 20 publications

(19 citation statements)

References 30 publications

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“…On the other hand, optical confinement phenomena take place at the position of some particular structural defects of the perovskite crystals, [ 38,39 ] similarly to what has been reported in 3D CsPbBr 3 perovskites. [ 40 ] When a defect induces a confining potential in the device plane, lasing action from multiple high‐energy confined states is observed in the real space maps ( Figure a,b) at the defect position and, as well, in the energy dispersion map (Figure 4c).…”

Section: Figurementioning

confidence: 74%

Observation of Two Thresholds Leading to Polariton Condensation in 2D Hybrid Perovskites

Polimeno

Fieramosca

Lerario

et al. 2020

Advanced Optical Materials

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Two dimensional (2D) perovskites are promising materials for photonic applications, given their outstanding nonlinear optical properties, ease of fabrication and versatility. In particular, exploiting their high oscillator strength, the crystalline form of 2D perovskites can be used as excitonic medium in optical microcavities, allowing for the study of their optical properties in the strong light-matter coupling regime. While polariton condensation has been observed in different materials at room temperature, here we observe for the first time two distinct threshold processes in a 2D perovskite, a material that * 2 has never shown spontaneous phase transition up to now. In particular, we demonstrate lasing from the bi-exciton state which contributes to populate the lower polariton branch and, at higher excitation powers, eventually leads to the formation of a polariton condensate. The emission linewidth narrowing and a spatial coherence over 50 × 50 µm 2 area are the smoking gun, the formation of a quantum coherent state in 2D hybrid perovskite. Our results not only show the formation of a polariton condensate in 2D perovskites but they are also crucial for the understanding of the physical mechanisms that leads to coherent phase transition in perovskite-based polariton microcavities.

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Section: Figurementioning

confidence: 74%

Observation of Two Thresholds Leading to Polariton Condensation in 2D Hybrid Perovskites

Polimeno

Fieramosca

Lerario

et al. 2020

Advanced Optical Materials

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show abstract

“…Here the τij represents the time interval between the maximum population for the i-th and the j-th LP branch). The here-observed underlying dynamics is confirmed by the modeling using rate equations (46,47). The calculation results are compared with the experimental data and are shown in Fig.…”

Section: Polariton Condensation Cascadementioning

confidence: 55%

“…Both static state angle-resolved PL spectroscopy as well as the femtosecond-resolved measurements are carried out at room temperature for different excitation strengths. We have used the rate equations characterizing multiple LP branches of the cascade (47,48) to model the dynamics of the polariton condensation under different excitation powers. The rate equations are written as follows.…”

Section: Methodsmentioning

confidence: 99%

Femtosecond Dynamics of a Polariton Bosonic Cascade at Room Temperature

Chen

Zhou

et al. 2022

Nano Lett.

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Whispering gallery modes in a microwire are characterized by a nearly equidistant energy spectrum. In the strong exciton-photon coupling regime, this system represents a bosonic cascade: a ladder of discrete energy levels that sustains stimulated transitions between neighboring steps. In this work, by using femtosecond angle-resolved spectroscopic imaging technique, the ultrafast dynamics of polaritons in a bosonic cascade based on a one-dimensional ZnO whispering gallery microcavity is explicitly visualized. Clear ladder-form build-up process from higher to lower energy branches of the polariton condensates are observed, which are well reproduced by modeling using rate equations. Moreover, the polariton parametric scattering dynamics are distinguished on a timescale of hundreds of femtoseconds. Our understanding of the femtosecond condensation and scattering dynamics paves the way towards ultrafast coherent control of polaritons at room temperature, which will make it promising for high-speed all-optical integrated applications.

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“…Furthermore, we took a step to verify the refractive index dispersion obtained from this iterative mode spacing model by the ARPL experiment. The ARPL experiment is commonly used to observe the dispersion relations of guided modes and also a suitable platform to study the polariton–LO phonon and polariton–polariton interaction dynamics. − Fortunately, ZnO MR possesses a 1D waveguide structure. Thus, we can utilize this method to observe the guided polariton modes inside the microrod.…”

Section: Methodsmentioning

confidence: 99%

Determination of Dispersion Relation and Optical Parameters Induced by Exciton–Polariton Effect in Whispering-Gallery Microcavities Using Photoluminescence Spectroscopy

Zhuang

Chang

et al. 2021

ACS Photonics

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To realize the refractive index dispersion accurately is essential for the design of optical devices. In this paper, we study hexagonal ZnO microrod cavities. We measure angle-resolved photoluminescence and use an iterative method to derive the refractive index dispersion near the band edge. Because of the large exciton binding energy in bulk ZnO, the photogenerated excitons are stable at room temperature. As a result, excitons could significantly affect the refractive index dispersion near the resonance energy. Thus, we construct a modified Lorentz oscillator model to extract the transverse and longitudinal exciton resonance energy and the damping term due to the scattering between LO-phonons and excitons at room temperature. The Rabi splitting energy and zero detuning point obtained by this method are reliable. The dispersion relations of polaritons measured by our angle-resolved photoluminescence agree well with the dispersion relation of polaritons, deduced by using the refractive index dispersion and optical parameters obtained by our theoretical model, thus, lending support to our theoretical model and the extracted parameters.

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Room temperature exciton–polariton condensate in an optically-controlled trap

Abstract: We study experimentally the optical properties and dynamics of an exciton–polariton condensate confined in an optically defined trap at room temperature.

Cited by 20 publications

References 30 publications

Observation of Two Thresholds Leading to Polariton Condensation in 2D Hybrid Perovskites

Observation of Two Thresholds Leading to Polariton Condensation in 2D Hybrid Perovskites

Femtosecond Dynamics of a Polariton Bosonic Cascade at Room Temperature

Determination of Dispersion Relation and Optical Parameters Induced by Exciton–Polariton Effect in Whispering-Gallery Microcavities Using Photoluminescence Spectroscopy

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