Formation dynamics of exciton-polariton vortices created by nonresonant annular pumping

Berger, Bernd; Schmidt, Daniel; Ma, Xuekai; Schumacher, Stefan; Schneider, Christian; Höfling, Sven; Aßmann, Marc

doi:10.1103/physrevb.101.245309

Cited by 17 publications

(3 citation statements)

References 41 publications

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“…The long range spatial and temporal correlation as well as phenomena such as condensation, vortices, and superfluidity have been realized in polaritonic systems [4][5][6][7][8]. So far, experimental studies have focused on static state measurements or exciton dynamics [9], and the highest time resolution is in the order of picosecond [4,10,11]. Nevertheless, room-temperature polariton condensates have shown broad potential in applications of compact polaritonic devices where exploration of the ultrafast dynamics is yet in urgent need.…”

Section: Introductionmentioning

confidence: 99%

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Chen

Zhou

et al. 2022

J. Phys.: Condens. Matter

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Based on ZnO microcavities with high quality factors, where the gain medium exhibits confinement of wave packets due to the intrinsically formed whispering gallery microcavity, strong coupling between excitons and cavity photons can be obtained at room temperature resulting in hybrid quasiparticles, e.g. exciton polaritons. In this work, polariton condensation is induced under the non-resonant excitation by linearly polarized femtosecond pulses with different polarization directions. The dynamical angle-resolved k-space spectra of the photoluminescence emission of polariton condensates are measured with sub-picosecond resolution by the self-developed femtosecond angle-resolved spectroscopic imaging technique. Our results show that the ultrafast dynamics of polariton condensation is sensitive to the polarization direction of the excitation pulses which can be explained qualitatively by the combined effect of selective excitation of distinct exciton modes in the sample and the effective coupling strength of the excitation pulses in the ZnO microcavity for various polarization directions. This work strengthened the understanding of the underlying physics of the condensation process for cavity exciton polaritons at room temperature.room temperature.

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Section: Introductionmentioning

confidence: 99%

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Chen

Zhou

et al. 2022

J. Phys.: Condens. Matter

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“…In the microcavity structures, the reservoir determines many important properties of the polariton radiation such as the threshold of the polariton laser, multistability, etc., see e.g., Refs. [7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Dynamics and control of nonradiative excitons - free carriers mixture in GaAs/AlGaAs quantum wells

Kurdyubov,

Trifonov,

Gribakin

et al. 2021

Preprint

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Dynamics of nonradiative excitons with large in-plane wave vectors forming a so-called reservoir is experimentally studied in a high-quality semiconductor structure containing a 14-nm shallow GaAs/Al0.03Ga0.97As quantum well by means of the non-degenerate pump-probe spectroscopy. The exciton dynamics is visualized via the dynamic broadening of the heavy-hole and light-hole exciton resonances caused by the exciton-exciton scattering. Under the non-resonant excitation free carriers are optically generated. In this regime the exciton dynamics is strongly affected by the excitoncarrier scattering. In particular, if the carriers of one sign are prevailing, they efficiently deplete the reservoir of the nonradiative excitons inducing their scattering into the light cone. A simple model of the exciton dynamics is developed, which considers the energy relaxation of photocreated electrons and holes, their coupling into excitons, and exciton scattering into the light cone. The model well reproduces the exciton dynamics observed experimentally both at the resonant and nonresonant excitation. Moreover, it correctly describes the profiles of the photoluminescence pulses studied experimentally. The efficient exciton-electron interaction is further experimentally verified by the control of the exciton density in the reservoir when an additional excitation creates electrons depleting the reservoir.

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“…Then there is also the problem of non-radiative excitons with large in-plane wave vectors [31,33,34]. In heterostructures, the density of the non-radiative excitons strongly depends not only on the experimental conditions of optical excitation, but also on the quality of the heterostructure.…”

Section: Introductionmentioning

confidence: 99%

Exciton-exciton and exciton-charge carrier interaction and the exciton collisional broadening in GaAs/AlGaAs quantum wells

Gribakin,

Khramtsov,

Trifonov

et al. 2021

Preprint

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Wave functions of heavy-hole excitons in GaAs/Al0.3Ga0.7As square quantum wells (QWs) of various widths are calculated by the direct numerical solution of a three-dimensional Schrödinger equation using a finite-difference scheme. These wave functions are then used to determine the exciton-exciton, exciton-electron and exciton-hole fermion exchange constants in a wide range of QW widths (5 − 150 nm). Additionally, the spin-dependent matrix elements of elastic excitonexciton, exciton-electron and exciton-hole scattering are calculated. From these matrix elements, the collisional broadening of the exciton resonance is obtained within the Born approximation as a function of the areal density of excitons, electrons and holes respectively for QW widths of 5, 15, 30 and 50 nm. The obtained numerical results are compared with other theoretical works.

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Formation dynamics of exciton-polariton vortices created by nonresonant annular pumping

Cited by 17 publications

References 41 publications

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Excitation-polarization-dependent dynamics of polariton condensates in the ZnO microwire at room temperature

Dynamics and control of nonradiative excitons - free carriers mixture in GaAs/AlGaAs quantum wells

Exciton-exciton and exciton-charge carrier interaction and the exciton collisional broadening in GaAs/AlGaAs quantum wells

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