Optical properties of cubic GaN from 1 to 20 eV

Feneberg, Martin; Röppischer, Marcus; Cobet, Christoph; Esser, N.; Schörmann, Jörg; Schupp, T.; As, D. J.; Hörich, Florian; Bläsing, J.; Krost, A.; Goldhahn, R.

doi:10.1103/physrevb.85.155207

Cited by 61 publications

(70 citation statements)

References 46 publications

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“…The resulting spectrum (thick black line) is compared to the previous calculation of Benedict et al 12 (dashed red line) which is performed in a LDA basis without including the EP interaction. The present calculation, instead, is in excellent agreement with the T = 10K experimental spectrum 6 (green bold line) and largely improves the Benedict result. We notice, indeed, that, compared to the Benedict calculation, the position and width of the main peak is in very good agreement with the experiment.…”

Section: Finite Temperature Optical Absorption Spectra Including supporting

confidence: 77%

“…In this case electron-electron correlation only has been included, by means of the well known GW approximation 14 . The corresponding quasi-particle (QP) gap, calculated by using the one-shot GW approximation on top of KohnShame (KS) HSE hybrid orbital (HSE+G 0 W 0 ) 6,15 , is 3.427 eV, which overestimates the experimental value of 3.295 eV 6 .…”

Section: Introductionmentioning

confidence: 90%

“…One of the approaches to eliminate these internal fields is the utilization of metastable non polar zinc-blende (zb) structures. It has also been reported that zb group IIInitrides have a quantum confined Stark effect in lowdimensional heterostructures 6 , high p-type conductivity in (Ga,Mn)N thin films 7 and negative differential resistance (NDR) at the resonant tunneling diode of the cubic Al(Ga)N/GaN 8,9 . Consequently a lot of interest is constantly attracted by this family of materials.…”

Section: Introductionmentioning

confidence: 96%

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Electron-electron and electron-phonon correlation effects on the finite-temperature electronic and optical properties of zinc-blende GaN

Kawai

Yamashita²,

Cannuccia³

et al. 2014

Phys. Rev. B

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We combine the effect of the electron-electron and electron-phonon interactions to study the electronic and optical properties of zb-GaN. We show that only by treating the two effects at the same time it is possible to obtain an unprecedented agreement of the zero and finite-temperature electronic gaps and absorption spectra with the experimental results. Compared to the state-ofthe-art results our calculations predict a large effect on the main absorption peak position and width as well as on the overall absorption lineshape. These important modifications are traced back to the combined electron-phonon damping mechanism and non uniform GW level corrections. Our results demonstrate the importance of treating on equal footing the electron and phonon mediated correlation effects to obtain an accurate description of the III-nitrides group physical properties.

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Section: Finite Temperature Optical Absorption Spectra Including supporting

confidence: 77%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Electron-electron and electron-phonon correlation effects on the finite-temperature electronic and optical properties of zinc-blende GaN

Kawai

Yamashita²,

Cannuccia³

et al. 2014

Phys. Rev. B

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show abstract

“…However, although the strong difference of SðtÞ for 370 and 380 nm indicates that the photoelastic effect is probably the dominant contribution, a detailed analysis is performed to exclude that the interface mechanism is responsible for the found behavior. In the beginning, we restrict our simulations to the photoelastic effect in the 100-nm GaN bulklike layer and the interface mechanism, since the complex index of refraction dispersion is known only for bulk material [20] but not for the QW. A model to calculate the reflectivity change ΔR normalized to the unperturbed value R 0 , which covers both effects, was developed before and is applied here to our experiment [12,21].…”

Section: Resultsmentioning

confidence: 99%

Picosecond Acoustics in Single Quantum Wells of Cubic GaN/(Al,Ga)N

et al. 2017

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A picosecond acoustic pulse is used to study the photoelastic interaction in single zinc-blende GaN=Al x Ga 1−x N quantum wells. We use an optical time-resolved pump-probe setup and demonstrate that tuning the photon energy to the quantum well's lowest electron-hole transition makes the experiment sensitive to the quantum well only. Because of the small width, its temporal and spatial resolution allows us to track the few-picosecond-long transit of the acoustic pulse. We further deploy a model to analyze the unknown photoelastic coupling strength of the quantum well for different photon energies and find good agreement with the experiments.

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“…Only recently a comprehensive study of the optical properties of cubic GaN in the near-band-gap excitonic region has been published. 9 More recently, the anharmonic phonon decay in c-GaN has been investigated by means of Raman scattering. 10 Whereas Brillouin scattering measurements providing a reliable experimental determinaton of the elastics constants were reported in wurtzite GaN, 11,12 the present knowledge of the elastic constants of cubic GaN comes mainly from molecular-dynamics and densityfunctional-theory calculations.…”

mentioning

confidence: 99%

Surface acoustic wave velocity and elastic constants of cubic GaN

Riobóo

Cuscó

Prieto

et al. 2016

Appl. Phys. Express

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We present high resolution Brillouin scattering measurements on cubic GaN layers grown on GaAs substrate. By using a suitable scattering geometry, scattering by surface acoustic waves was recorded for different azimuthal angles and the surface acoustic wave velocities were determined.The comparison of the experimental results with numerical simulations of the azimuthal dependence of the surface wave velocity shows good agreement and allowed us to determine a consistent set of elastic constants for c-GaN.

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Optical properties of cubic GaN from 1 to 20 eV

Cited by 61 publications

References 46 publications

Electron-electron and electron-phonon correlation effects on the finite-temperature electronic and optical properties of zinc-blende GaN

Electron-electron and electron-phonon correlation effects on the finite-temperature electronic and optical properties of zinc-blende GaN

Picosecond Acoustics in Single Quantum Wells of Cubic GaN/(Al,Ga)N

Surface acoustic wave velocity and elastic constants of cubic GaN

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