Complex dielectric constant of Cd<sub>0.8</sub>SMn<sub>0.2</sub>Te crystals near the fundamental absorption edge

Safonova, L.; Brazis, R.; Narkowicz, R.

doi:10.3952/lithjphys.44602

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…The enhanced light emission and absorption by the fractured surface and particularly unexpected bright 1 OA peak position for Cd 0.8 Mn 0.2 Te, as shown in Fig. 4, has been determined in earlier experiments [31]. photoluminescence observed on the dark side of Cd 0.8 Mn 0.2 Te crystals are encouraging features for experimental research continuation aiming at a more controllable technology.…”

Section: Resultssupporting

confidence: 70%

“…2). The crystallite PL peak positions are red-shifted relative to the peak of fundamental absorption (being at 1.91 eV for this particular Mn mole fraction x = 0.2 [31]).…”

Section: Methodsmentioning

confidence: 86%

“…1with the values of n(E) and κ(E) for Cd 0.8 Mn 0.2 Te as given by the complex dielectric function ε(E) deduced from reflectivity measurements in Ref. [31], supposing the effective temperature to be T ef = 400 K. The adjustable effective temperature is conventionally attributed to the light-emitting ensemble (exci-tons, electron-hole gas, etc. ); therefore, it is set high compared to the crystal lattice temperature.…”

Section: Theorymentioning

confidence: 99%

“…We take again the complex dielectric function ε(E) of Cd 0.8 Mn 0.2 Te as deduced from reflectivity measurements in Ref. [31] keeping the background component independent of whether the crystal is in normal or in excited state and inverting sign (when modelling emission) of the component of inter-band transitions. This model gives the PL line shape and peak position in good agreement with the experiment (Fig.…”

Section: Theorymentioning

confidence: 99%

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Surface-fracture-related photoluminescence of CdMnTe crystals

Brazis¹,

Selskis²,

Kukliński³

et al. 2012

Lith. J. Phys.

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Enhanced photoluminescence from sub-wavelength crystallites attached to the fractured surface of cleaved host crystals, and the transfer of emitted light to the dark side of macroscopically thick absorbing samples of Cd 1-x Mn x Te with x = 0.2 is reported. The conventional model based on Kirchhoff 's law of radiation is found to fail to describe the experimental photoluminescence line and its red shift relative to the optical absorption, and a more adequate novel theoretical model implying population inversion is proposed.

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Section: Resultssupporting

confidence: 70%

“…2). The crystallite PL peak positions are red-shifted relative to the peak of fundamental absorption (being at 1.91 eV for this particular Mn mole fraction x = 0.2 [31]).…”

Section: Methodsmentioning

confidence: 86%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

See 2 more Smart Citations

Surface-fracture-related photoluminescence of CdMnTe crystals

Brazis¹,

Selskis²,

Kukliński³

et al. 2012

Lith. J. Phys.

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“…The spectrum and wavefunction of the photonic bands are calculated by solving the Maxwell equations using the plane wave expansion method [60]. In calculating the photonic bands in Cd 0.4 Mg 0.6 Te/Cd 0.8 Mn 0.2 Te Fabry-Pérot cavity the dielectric constants for Cd 0.4 Mg 0.6 Te is 7.0 (linear interpolation between the dielectric constant of CdTe, 8.5 [49], and that of MgTe, 6.0 [50]) while the dielectric constant of Cd 0.8 Mn 0.2 Te is 7.8 [74]. The electronic structures are calculated using the effective mass approximation [45].…”

Section: Discussionmentioning

confidence: 99%

Photonic Crystal Architecture for Room-Temperature Equilibrium Bose-Einstein Condensation of Exciton Polaritons

Jiang

John

2014

Phys. Rev. X

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We describe photonic crystal microcavities with very strong light-matter interaction to realize roomtemperature, equilibrium, exciton-polariton Bose-Einstein condensation (BEC). This goal is achieved through a careful balance between strong light trapping in a photonic band gap (PBG) and large exciton density enabled by a multiple quantum-well (QW) structure with a moderate dielectric constant. This approach enables the formation of a long-lived, dense 10 − μm − 1 − cm-scale cloud of exciton polaritons with vacuum Rabi splitting that is roughly 7% of the bare exciton-recombination energy. We introduce a woodpile photonic crystal made of Cd 0.6 Mg 0.4 Te with a 3D PBG of 9.2% (gap-to-central-frequency ratio) that strongly focuses a planar guided optical field on CdTe QWs in the cavity. For 3-nm QWs with 5-nm barrier width, the exciton-photon coupling can be as large as ℏΩ ¼ 55 meV (i.e., a vacuum Rabi splitting of 2ℏΩ ¼ 110 meV). The exciton-recombination energy of 1.65 eV corresponds to an optical wavelength of 750 nm. For N ¼ 106 QWs embedded in the cavity, the collective exciton-photon coupling per QW (ℏΩ= ffiffiffiffi N p ¼ 5.4 meV) is much larger than the state-of-the-art value of 3.3 meV, for the CdTe Fabry-Pérot microcavity. The maximum BEC temperature is limited by the depth of the dispersion minimum for the lower polariton branch, over which the polariton has a small effective mass of approximately 10 −5 m 0 , where m 0 is the electron mass in vacuum. By detuning the bare exciton-recombination energy above the planar guided optical mode, a larger dispersion depth is achieved, enabling room-temperature BEC. The BEC transition temperature ranges as high as 500 K when the polariton density per QW is increased to ð11a B Þ −2 , where a B ≃ 3.5 nm is the exciton Bohr radius and the exciton-cavity detuning is increased to 30 meV. A high-quality PBG can suppress exciton radiative decay and enhance the polariton lifetime to beyond 150 ps at room temperature, sufficient for thermal equilibrium BEC.

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Polarized Light Absorption in Wurtzite InP Nanowire Ensembles

et al. 2015

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We investigate the absorption properties of ensembles of wurtzite (WZ) InP nanowires (NWs) by high-resolution polarization-resolved photoluminescence excitation (PLE) spectroscopy at T = 10 K. The degree of linear polarization of absorbed light, ρ(abs), resulting from the PLE spectra is governed by a competition between the dielectric mismatch effect and the WZ selection rules acting differently on different optical transitions. These two contributions are deconvoluted with the help of finite-difference time-domain simulations, thus providing information about the symmetry of the three highest valence bands (A, B, and C) of WZ InP and the extent of the spin-orbit interaction on these states. Moreover, ρ(abs) shows two characteristic dips corresponding to the two sharp A and B exciton resonances in the PLE spectra. A model developed for the dip in A provides the first experimental evidence of an enhancement in the dielectric mismatch effect originating from the Coulomb interaction between electron and hole.

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Complex dielectric constant of Cd_0.8SMn_0.2Te crystals near the fundamental absorption edge

Cited by 4 publications

References 12 publications

Surface-fracture-related photoluminescence of CdMnTe crystals

Surface-fracture-related photoluminescence of CdMnTe crystals

Photonic Crystal Architecture for Room-Temperature Equilibrium Bose-Einstein Condensation of Exciton Polaritons

Polarized Light Absorption in Wurtzite InP Nanowire Ensembles

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Complex dielectric constant of Cd0.8SMn0.2Te crystals near the fundamental absorption edge

Cited by 4 publications

References 12 publications

Surface-fracture-related photoluminescence of CdMnTe crystals

Surface-fracture-related photoluminescence of CdMnTe crystals

Photonic Crystal Architecture for Room-Temperature Equilibrium Bose-Einstein Condensation of Exciton Polaritons

Polarized Light Absorption in Wurtzite InP Nanowire Ensembles

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Product

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Complex dielectric constant of Cd_0.8SMn_0.2Te crystals near the fundamental absorption edge