Polariton linewidth and the reservoir temperature dynamics in a semiconductor microcavity

Belykh, V. V.; Sob’yanin, D. N.

doi:10.1103/physrevb.89.245312

Cited by 6 publications

(7 citation statements)

References 52 publications

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“…It is significantly smaller than that of a quasiequilibrium condensate formed under a nonresonant excitation [39]. That is well expected as the decoherence in a resonantly pumped system is mainly due to the scattering on phonons, whereas nonresonantly pumped condensates lose their coherence through the interaction with an exciton reservoir that is inevitably excited in the latter case [40,41].…”

Section: Methodsmentioning

confidence: 81%

Nonlinear route to intrinsic Josephson oscillations in spinor cavity-polariton condensates

et al. 2014

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The intrinsic Josephson effect is observed in a two-component polariton condensate in a strained planar microcavity under a resonant pulsed excitation such that only one of the two linearly polarized eigenstates is pumped from the outside. On reaching the threshold density, the polariton-polariton interaction involves a spontaneous breaking of the symmetry between spin-up and spin-down polaritons. As a result, the condensate acquires nearly circular polarization while the pump is strong and then passes to the Josephson oscillation regime since the pump weakens.

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Section: Methodsmentioning

confidence: 81%

Nonlinear route to intrinsic Josephson oscillations in spinor cavity-polariton condensates

et al. 2014

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“…On the other hand, the degree of the modulation in the spectrum and the amplitude of the satellites in

g^{false(1 false)}

are determined by the backreflection efficiency

false| r false|

. Below the threshold

γ_{MC}^{- 1} ≪ Δ t

and the central peak in

g^{false(1 false)}

almost coincides with the temporal coherence function of the emission of the MC itself

g_{MC}^{false(1 false)} false(τ false) = exp false(- γ_{MC} τ / 2 false)

() which is shown by the red dashed line in Fig. (b), while the overall width of the spectrum coincides with the width of the emission spectrum of the MC itself which is shown by the red dashed line in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(a). The temporal coherence function

g^{false(1 false)} false(τ false)

, calculated as the Fourier transform of

S false(ω false)

() (Fig. (b)) shows the satellites separated by the time

Δ t = 2 π / Δ ω

that corresponds to the light travel time forth and back in the external resonator.…”

Section: Resultsmentioning

confidence: 99%

“…In this case,

γ

is determined by the properties of the MC itself: the polariton escape rate

γ_{er}

and the mean population of the given state

〈 N 〉

γ = γ_{er} / false(1 + 〈 N 〉 false)

as is described in Ref. (). On the other hand, when

γ^{- 1} \sim Δ t / 2

or, equivalently,

〈 N 〉 \sim γ_{er} Δ t / 2

(

\sim 10

for our MC), the external resonator significantly modifies the MC temporal coherence and width of the spectrum.…”

Section: Resultsmentioning

confidence: 99%

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Effect of an external resonator on the stimulated emission of a semiconductor microcavity with embedded quantum wells

Belykh

Mylnikov

2015

Physica Status Solidi (b)

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The effect of an external resonator on the emission of a GaAs microcavity with embedded quantum wells is investigated experimentally and theoretically. It was shown that the external resonator controls the process of the stimulated emission of the microcavity leading to the threshold-like appearance of closely separated modes in a spectrum and to oscillations in the temporal dynamics of the emission. Investigation of the spatial coherence with a temporal resolution shows a complex phase dynamics related to the interplay between the lasing modes and reveals a strong spatial inhomogeneity of a phase within each mode. [7] and the relation between polariton and photon BEC and a conventional laser is actively discussed [8][9][10][11][12]. It should be noted, however, that true BEC in a pure two-dimensional system, such as an ideal planar MC, is impossible according to the HohenbergMermin-Wagner theorem [13]. Therefore, polariton condensation observed in the experiments results from the finite size of the system, which is limited either by the excitation spot or by a lateral confining potential for polaritons. This potential is formed by an MC lateral disorder [5,14,15], applied stress [16], or artificially by producing MC micropillars [17,18]. It provides a favorable condition for the polariton condensation [16] and leads to a significant modification of

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“…Thus, the biexciton concentration is far from the equilibrium one due to the short radiative decay time of biexcitons compared to the biexciton formation/dissociation time. The biexciton population is driven by the excitons just like the nonequilibrium polariton population in a microcavity is driven by the exciton reservoir [42].…”

Section: Exciton-biexciton Thermodynamicsmentioning

confidence: 99%

Heating by exciton and biexciton recombination in GaAs/AlGaAs quantum wells

Belykh

Kochiev

2015

Phys. Rev. B

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A comprehensive experimental investigation of exciton and biexciton recombination in GaAs/AlGaAs quantum wells is presented. Exciton and biexciton recombination times are found to be 16 and 55 ps, respectively. A method of determining the dynamics of the exciton temperature is developed. It is shown that both exciton and biexciton recombination processes increase the exciton temperature by an amount as high as ∼ 10 K. These processes impose a new restriction on the possibility of exciton Bose-Einstein condensation and make impossible its achievement in a system of direct excitons in GaAs quantum wells even for resonantly excited exciton gas.

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Polariton linewidth and the reservoir temperature dynamics in a semiconductor microcavity

Cited by 6 publications

References 52 publications

Nonlinear route to intrinsic Josephson oscillations in spinor cavity-polariton condensates

Nonlinear route to intrinsic Josephson oscillations in spinor cavity-polariton condensates

Effect of an external resonator on the stimulated emission of a semiconductor microcavity with embedded quantum wells

Heating by exciton and biexciton recombination in GaAs/AlGaAs quantum wells

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