Coupling of GaN- and AlN-like longitudinal optic phonons in Ga1−xAlxN solid solutions

1998 ◽  
Vol 72 (21) ◽  
pp. 2674-2676 ◽  
Author(s):  
F. Demangeot ◽  
J. Groenen ◽  
J. Frandon ◽  
M. A. Renucci ◽  
O. Briot ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Longitudinal Optic ◽  
Longitudinal Optic Phonons

Evaluation of the internal field produced by longitudinal optic phonons in ZnSe crystals

1983 ◽  
Vol 61 (7) ◽  
pp. 1017-1020 ◽  
Author(s):  
J. Daunay ◽  
Jac. Daunay ◽  
P. Bugnet
Keyword(s):  
Room Temperature ◽  
Internal Field ◽  
Mean Square ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Longitudinal Optic ◽  
The Mean ◽  
Increasing Temperature ◽  
Franz Keldysh Effect ◽  
Longitudinal Optic Phonons

Measurements of light absorption on ZnSe single crystals, conducted from 80 K to room temperature, show that the forbidden band gap decreases with increasing temperature because of the electron–phonon interaction. It is established for temperatures ranging from 140 to 320 K that longitudinal optic (LO) and acoustic (A) phonons operate simultaneously and exclusively so that [Formula: see text]. The first term, resulting from the Franz–Keldysh effect applied to the mean square field produced by LO phonons, provides the value of this field. It reaches 105 V cm−1 at room temperature.

scholarly journals Raman study of Ga1−xAlxN solid solutions

1997 ◽  
Vol 2 ◽  
Author(s):  
F. Demangeot ◽  
J. Groenen ◽  
J. Frandon ◽  
M. A. Renucci ◽  
Olivier Briot ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid Solutions ◽  
The Other ◽  
Optical Phonons ◽  
Long Wavelength ◽  
Discrete Mode ◽  
Compositional Range ◽  
Dielectric Model ◽  
Longitudinal Optic ◽  
Raman Study

Long wavelength optical phonons of AlxGa1−xN solid solutions have been identified in the whole compositional range by Raman spectroscopy. The frequencies of A1 and E1 polar phonons increase continuously with x from one-member crystal to the other. A generalization of the dielectric model of Hon and Faust is used to treat the coupling of the longitudinal optic (LO) mode. This approach accounts for the observed frequencies and confirms the so-called one-mode behaviour of polar LO phonons. Moreover,a signature of the coupling of a discrete mode (tentatively associated to silent q=0 B1 mode) with an unidentified continuum has been obtained.

Line shapes of longitudinal-optic phonons in sodium chloride at 300 and 600 K

1983 ◽  
Vol 28 (2) ◽  
pp. 993-996 ◽  
Author(s):  
E. R. Cowley ◽  
S. Satija ◽  
R. Youngblood
Keyword(s):  
Sodium Chloride ◽  
Line Shapes ◽  
Longitudinal Optic ◽  
Longitudinal Optic Phonons

Two-dimensional magnetopolaron coupling to both homopolar and longitudinal optic phonons in the layer compound InSe

1989 ◽  
Vol 1 (40) ◽  
pp. 7493-7498 ◽  
Author(s):  
D F Howell ◽  
R J Nicholas ◽  
C J G M Langerak ◽  
J Singleton ◽  
T J B M Janssen ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Layer Compound ◽  
Longitudinal Optic ◽  
Longitudinal Optic Phonons

Electron mobility in n-type Hg1−xCdxTe and Hg1−xZnx Te alloys

1992 ◽  
Vol 7 (8) ◽  
pp. 2211-2218 ◽  
Author(s):  
J.D. Patterson ◽  
Wafaa A. Gobba ◽  
S.L. Lehoczky
Keyword(s):  
Boltzmann Equation ◽  
Mercury Cadmium Telluride ◽  
Energy Gap ◽  
Material Parameters ◽  
Energy Gaps ◽  
Comparison With Experiment ◽  
Longitudinal Optic ◽  
Compositional Disorder ◽  
Future Work ◽  
Longitudinal Optic Phonons

We have calculated the mobility of electrons in n-type Mercury Cadmium Telluride (MCT) and compared it to a calculation of the mobility of electrons in n-type Mercury Zinc Telluride (MZT) with nearly the same energy gap and with the same number of donors and acceptors. We also compared the results of the MZT calculation with experiment. We found for equivalent energy gaps that the mobilities in the two compounds (MCT, MZT) were nearly the same. The calculations for both MCT and MZT were based on the best set of material parameters that we could compile from the literature. Using these parameters, the comparison with experiment for MZT yielded good results. Since MZT is harder and structurally more stable with respect to Hg retention than MCT, the possibility of equivalent mobility for MCT and MZT is significant. This calculation is one of the first extensive calculations of the mobility of MZT, and we compared it with another which appeared to be less extensive. Our calculation involves scattering of the electrons by longitudinal optic phonons, acoustic phonons, ionized impurities, holes, and compositional disorder. Since not all of these interactions can be approximated by elastic scattering, the corresponding Boltzmann equation was solved by a variational principle. We also discuss directions for future work.

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