Blueshifted Flat Dispersion Relation of Exciton–Polariton Condensates in a CuBr Microcavity

Nakayama, Masaaki; Murakami, Katsuya; Kim, DaeGwi

doi:10.7566/jpsj.85.054702

Cited by 5 publications

(8 citation statements)

References 39 publications

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“…The visibility of the GB is strongly suppressed in both the PL and gain/absorption spectra, although a trace of it is seen as a very weak PL emission and a small but finite optical gain or a suppres- sion of absorption band (hole burning) from the GB, as pointed by the arrows in Figs. 6 and 7, also in agreement with experiments [35,[42][43][44][45].…”

Section: Photoluminescence and Gain/absorption Spectra Of A Drivesupporting

confidence: 91%

“…2(a1)-(c1), we show that the visibility of the GB in PL L(q, ω) is strongly suppressed by nonequilibrium effects, where a peak structure of the GB is either absent or possess a very small spectral weight. Our calculated PL is in a qualitative agreement with experiments [35,[42][43][44][45] where it exhibits a blue shift of the emission from the condensate, the appearance of the flat spectrum of the diffusive Goldstone mode, and suppression of spectral weight in the dispersive region at high momentum region, as the pumping power increases. The amount of the blue shift and the range of the momentum window that exhibits the dispersionless feature have the same order of magnitude as that observed in GaAs experiments [35,42].…”

Section: Introductionsupporting

confidence: 88%

“…This is demonstrated in Fig. 10, where we have used the fluctuation-dissipation theorem (43) to calculate PL at a realistic (bath) temperature T b = 10K. The strong visibility of the GB is attributed to the property that the absolute value of the Bose distribution |b(ω − )| in the negative energy region ω − < 0 is always larger than that at positive energy with the same absolute value 43), the PL intensity of NB and GB are comparable.…”

Section: Photoluminescence and Gain/absorption Spectra Of A Drivementioning

confidence: 92%

“…By detecting the energy as well as its (in-plane) momenta of the leaked-out photons, the distribution of the polaritons can be measured in terms of momentum and energy. Using this technique, the dispersionless feature of the diffusive Goldstone mode has been observed [35,36,[42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

“…(Color online) Calculated photoluminescence spectra on resonance δ = 0 at finite (bath) temperature T b = 10K in the equilibrium limit κ = 0, where we used the fluctuation-dissipation theorem(43). (a) µ b = −8.4meV.…”

mentioning

confidence: 99%

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Photoluminescence and gain/absorption spectra of a driven-dissipative electron-hole-photon condensate

2018

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We investigate theoretically nonequilibrium effects on photoluminescence and gain/absorption spectra of a driven-dissipative exciton-polariton condensate, by employing the combined Hartree-Fock-Bogoliubov theory with the generalized random phase approximation extended to the Keldysh formalism. Our calculated photoluminescence spectra is in semiquantitative agreement with experiments, where features such as a blue shift of the emission from the condensate, the appearance of the dispersionless feature of a diffusive Goldstone mode, and the suppression of the dispersive profile of the mode are obtained. We show that the nonequilibrium nature of the exciton-polariton condensate strongly suppresses the visibility of the Bogoliubov dispersion in the negative energy branch (ghost branch) in photoluminescence spectra. We also show that the trace of this branch can be captured as a hole burning effect in gain/absorption spectra. Our results indicate that the nonequilibrium nature of the exciton-polariton condensate strongly reduces quantum depletion, while a scattering channel to the ghost branch is still present.PACS numbers: 03.75. Ss, ("X" in the right panel of Fig. 3(b)), where E bind X is the exciton binding energy. This allows us to define the detuning parameter between the cavity photon and the exciton state, (See the right panel of Fig. 3(b).) δ = ω cav − ω X .(3)

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Section: Photoluminescence and Gain/absorption Spectra Of A Drivesupporting

confidence: 91%

Section: Introductionsupporting

confidence: 88%

Section: Photoluminescence and Gain/absorption Spectra Of A Drivementioning

confidence: 92%