Effects of compositional disorder on phonons in layered semiconductor microstructures

Bechstedt, F.; Gerecke, H.; Grille, H.

doi:10.1103/physrevb.47.13540

Cited by 20 publications

(5 citation statements)

References 44 publications

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“…Instead of TO(L) the TA(L) mode frequency is considered, in order to avoid unphysical (i.e., imaginary) acoustic frequencies. Unfortunately, there are only experimental frequencies for the G In order to describe the lattice-dynamical properties of the pseudobinary alloys X x Ga 1Àx N we apply a generalization [18,26] of the modified random-element-isodisplacement (MREI) model [27]. In contrast to the MREI model its generalization allows the description of arbitrary phonons with arbitrary wave vectors in arbitrary crystallographic structures of the mixed crystal without taking into account any additional force constant.…”

Section: Alloy Treatment and Lattice Dynamicsmentioning

confidence: 99%

Lattice Dynamics of Ternary Alloys

Bechstedt¹,

Grille

1999

phys. stat. sol. (b)

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Section: Alloy Treatment and Lattice Dynamicsmentioning

confidence: 99%

Lattice Dynamics of Ternary Alloys

Bechstedt¹,

Grille

1999

phys. stat. sol. (b)

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“…The composition of the nanocrystals and the phonon energy of them could be changed during the heat‐treatment process. Bechstedt et al . suggest that in A x B 1 −x C alloys, the long‐wavelength optical phonons vary continuously and approximately linearly with the molar fraction x of the alloy.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Crystallization and Optical Properties of Ca_1−xLa_xF_2+x Glass‐Ceramics

et al. 2014

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Transparent oxyfluoride glass‐ceramics containing Er3+, Yb3+:Ca1−xLaxF2+x nanocrystals, which may have potential applications in the fields of solid‐state laser and luminescence, were prepared. Crystallization of Ca1−xLaxF2+x and behavior of Yb3+ and Er3+ during the heat treatment was investigated. Results showed that alumina content had a significant effect on crystallization of Ca1−xLaxF2+x in the SiO2–Al2O3–CaF2–LaF3 system. Due to the size of phase‐separated areas, the size of the crystals during the heat treatment did not change significantly. After crystallization of Ca1−xLaxF2+x in the glass, the majority of Er3+ ions incorporated into the Ca1−xLaxF2+x crystals during the heat‐treatment process. Time‐resolved luminescence of Er3+ ions in the samples around 842 nm showed that the solubility of Er3+ ions in Ca1−xLaxF3 crystals is higher than pure CaF2 crystals. The glass undergoes an enormous phase separation, which keeps the Yb3+ ions within the other separated phase. Therefore, only at high temperatures (790°C) or with a long heat‐treatment time (72 h), there is a possibility for Yb3+ ions to be incorporated into the fluorine phase.

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“…Raman spectroscopy is an extremely useful tool for non-destructive studies of the phonon spectrum of SLs with a high spatial resolution. A significant number of publications are devoted to theoretical and experimental studies of the Raman spectrum of binary SLs caused by diffusion of interfaces [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. However, most of them focus on GaAs/AlAs-based SLs.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Interface Diffusion on Raman Spectra of Wurtzite Short-Period GaN/AlN Superlattices

et al. 2021

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We present an extensive theoretical and experimental study to identify the effect on the Raman spectrum due to interface interdiffusion between GaN and AlN layers in short-period GaN/AlN superlattices (SLs). The Raman spectra for SLs with sharp interfaces and with different degree of interface diffusion are simulated by ab initio calculations and within the framework of the random-element isodisplacement model. The comparison of the results of theoretical calculations and experimental data obtained on PA MBE and MOVPE grown SLs, showed that the bands related to A1(LO) confined phonons are very sensitive to the degree of interface diffusion. As a result, a correlation between the Raman spectra in the range of A1(LO) confined phonons and the interface quality in SLs is obtained. This opens up new possibilities for the analysis of the structural characteristics of short-period GaN/AlN SLs using Raman spectroscopy.

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Effects of compositional disorder on phonons in layered semiconductor microstructures

Cited by 20 publications

References 44 publications

Lattice Dynamics of Ternary Alloys

Lattice Dynamics of Ternary Alloys

Investigation on Crystallization and Optical Properties of Ca_1−xLa_xF_2+x Glass‐Ceramics

The Effect of Interface Diffusion on Raman Spectra of Wurtzite Short-Period GaN/AlN Superlattices

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Effects of compositional disorder on phonons in layered semiconductor microstructures

Cited by 20 publications

References 44 publications

Lattice Dynamics of Ternary Alloys

Lattice Dynamics of Ternary Alloys

Investigation on Crystallization and Optical Properties of Ca1−xLaxF2+x Glass‐Ceramics

The Effect of Interface Diffusion on Raman Spectra of Wurtzite Short-Period GaN/AlN Superlattices

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Investigation on Crystallization and Optical Properties of Ca_1−xLa_xF_2+x Glass‐Ceramics