Long-range correlations in a 97% excitonic one-dimensional polariton condensate

Trichet, A. A. P.; Durupt, Emilien; Médard, François; Datta, Sanjoy; Minguzzi, Anna; Richard, Maxime

doi:10.1103/physrevb.88.121407

Cited by 24 publications

(27 citation statements)

References 41 publications

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“…[16] for details), which is in very good agreement with earlier publications [17]. Figure 1 shows that the WGM exciton-polariton system is multimodal, i.e., several photonic WGMs with different axial mode numbers strongly couple to the excitonic transitions [18].…”

supporting

confidence: 79%

“…In order to assess if WGMs and ZnO excitons strongly interact with each other, a careful remodeling of the photonic WGM dispersion curves is indispensable. In our case, we determine an average coupling strength of around 100 meV between ZnO excitons and WGM photons (see Ref.[16] for details), which is in very good agreement with earlier publications [17]. Figure 1 shows that the WGM exciton-polariton system is multimodal, i.e., several photonic WGMs with different axial mode numbers strongly couple to the excitonic transitions [18].…”

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confidence: 72%

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Parametric relaxation in whispering gallery mode exciton-polariton condensates

et al. 2015

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Polariton condensation of one-dimensional multimode whispering gallery mode exciton polaritons is investigated in hexagonal ZnO microwires at cryogenic temperatures. At threshold, stimulated scattering is fed by the resonant emission from highly populated defect-bound excitons. With further increasing excitation power, condensates relax within the multimode whispering gallery mode polariton ladder, leading to their effective evaporative cooling. The relaxation is a parametric polariton-polariton scattering process evidenced by its intensity, energy, and momentum evolution. The experimental observations are in good agreement with numerical simulations based on a model for polariton-polariton scattering extended to the multimodal whispering gallery mode system. [4]. Multimode polariton systems that undergo inter-or intrabranch parametric scattering processes [5][6][7] are promising for sources of entangled photons [8][9][10]. However, using those effects in integrated optical circuits requires manipulability and guidability that is more easily achieved in one-dimensional microcavities. A major step towards this goal has recently been demonstrated in polariton microcavities etched into wire-shaped structures resulting in the formation of one-dimensional polariton condensates with long polariton lifetimes and long propagation lengths [11]. Although parametric oscillation processes have already been demonstrated in those structures [6], a richer mode structure is necessary for the creation of entangled polaritons [8]. Our "bottom up" approach for the creation of one-dimensional multimode polariton systems combines the excellent photonic properties of whispering gallery modes (WGMs) with the outstanding electronic properties of excitons in hexagonal ZnO microwires. Beneficially, ZnO microwires can easily be grown by carbothermal vapor-phase transport [12] and naturally provide strong photonic confinement by total internal reflection (TIR) [13]. Hence, they obviate the need for highly reflecting Bragg mirrors and sophisticated fabrication steps. One-dimensional WGM exciton-polariton condensates in those ZnO microwires then benefit from the multimodal character of the photonic component along with a long photon lifetime. * cpd3@st-andrews.ac.uk † schmidt-grund@physik.uni-leipzig. de Here, we demonstrate the condensation of WGM exciton polaritons at cryogenic temperature being accompanied by complex parametric polariton scattering processes. We observe an efficient exciton relaxation into defect-bound states, whose radiative decay resonantly excites the polariton condensate above threshold in one of the many lower polariton branches. By increasing the excitation power, condensate relaxation into further lower polariton states takes place, providing an efficient evaporative cooling mechanism. We show experimentally and theoretically that this process is caused by multichannel scattering mechanisms leading to parametric mixing of polariton states at higher excitation densities, as evidenced by constant energy and momen...

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confidence: 79%

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confidence: 72%

Parametric relaxation in whispering gallery mode exciton-polariton condensates

et al. 2015

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“…the energy difference between the bare exciton and the bare cavity modes). 22 This is illustrated with the GaN microcavity in figure 3(c), where the LPB dispersion has been imaged for several detunings, going from slightly positive to negative values and leading to excitonic fractions from 56% (leftmost panel) to 11% (rightmost panel). In this case, the strongcoupling manifests itself as an increase of the LPB effective mass as the bare exciton energy is approached.…”

Section: Lpn-cnrs Route De Nozay 91460 Marcoussis Francementioning

confidence: 99%

Patterned silicon substrates: A common platform for room temperature GaN and ZnO polariton lasers

Zúñiga‐Pérez

Mallet

Hahe

et al. 2014

Applied Physics Letters

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A new platform for fabricating polariton lasers operating at room temperature is introduced: nitride-based distributed Bragg reflectors epitaxially grown on patterned silicon substrates. The patterning allows for an enhanced strain relaxation thereby enabling to stack a large number of crack-free AlN/AlGaN pairs and achieve cavity quality factors of several thousands with a large spatial homogeneity. GaN and ZnO active regions are epitaxially grown thereon and the cavities are completed with top dielectric Bragg reflectors. The two structures display strong-coupling and polariton lasing at room temperature and constitute an intermediate step in the way towards integrated polariton devices.

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“…Indeed, in similar experimental conditions (non-resonant, pico-or femto-second pulse excitation, 6 K < T < 10 K), a typical excitation threshold of 4 lJ=cm 2 P thr 30 lJ=cm 2 can be found in the literature in GaAs-based planar microcavities 2,27,28 of 62 lJ/cm 2 in CdTe planar microcavities 29 and of 8 lJ/cm 2 in high quality ZnO microwires. 30 Fig. 3(b) shows how the excitation threshold changes when passing from lasing in a planar area of the microcavity to lasing in micropillars of decreasing diameters and a similar detuning (within the small optical confinement energy).…”

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confidence: 99%