Mechanisms of Raman Scattering in doped Indium Nitride

2004 ◽  
Vol 831 ◽  
Author(s):  
Claire Pinquier ◽  
François Demangeot ◽  
Jean Frandon ◽  
Miguel Gaio ◽  
Olivier Briot ◽  
...  
Keyword(s):  
Light Scattering ◽  
Raman Scattering ◽  
Charge Density ◽  
Dielectric Function ◽  
Density Fluctuation ◽  
Indium Nitride ◽  
Longitudinal Optical ◽  
Optical Mode ◽  
Longitudinal Optical Mode ◽  
Strong Mode

ABSTRACTHighly n-doped InN layers are investigated by means of Raman scattering: a strong mode is evidenced near the frequency of the A1(LO) phonon, despite the high conductivity of the films. This observation is interpreted assuming the breakdown of the wave-vector conservation leading to the decoupling of the plasmon from the phonon. The lineshape of the longitudinal optical mode is simulated using the Lindhard-Mermin dielectric function for various light scattering processes: we found that the charge density fluctuation mechanism is dominant, at least in the visible excitation range.

Experimental detection of collective modes In a polar liquid: application to the case of the solvated electron in H2O and NH3

1977 ◽  
Vol 55 (11) ◽  
pp. 1916-1919 ◽  
Author(s):  
Gianni Ascarelli
Keyword(s):  
Ionic Crystal ◽  
Collective Mode ◽  
Continuum Theory ◽  
Longitudinal Optical ◽  
Collective Modes ◽  
Coupling Constant ◽  
Optical Mode ◽  
Solvated Electron ◽  
Low Frequencies ◽  
Longitudinal Optical Mode

We present experimental data that confirm the predicted existence of a collective mode in a liquid corresponding to the longitudinal optical mode in an ionic crystal. The experimental investigation was carried out in nitromethane, and the results bear out all the calculated properties of this collective mode: the dipolar plasmon. The calculated frequency of the dipolar plasmon, as well as the dielectric constant at high and low frequencies, are then used to calculate without adjustable parameters the polaron coupling constant of the solvated electron in NH3 and H2O. A comparison of the calculated and measured properties of the solvated electron indicates that in either case a polaron-like continuum theory can at most account for only a fraction of the energy of the observed optical absorption.

Redshift ofA1(longitudinal optical) mode for GaN crystals under strong electric field

2017 ◽  
Vol 11 (1) ◽  
pp. 011002 ◽  
Author(s):  
Hong Gu ◽  
Kaijie Wu ◽  
Shunan Zheng ◽  
Lin Shi ◽  
Min Zhang ◽  
...  
Keyword(s):  
Electric Field ◽  
Strong Electric Field ◽  
Longitudinal Optical ◽  
Optical Mode ◽  
Longitudinal Optical Mode

scholarly journals Raman scattering evidence for a cascade evolution of the charge-density-wave collective amplitude mode

2010 ◽  
Vol 81 (8) ◽  
Author(s):  
M. Lavagnini ◽  
H.-M. Eiter ◽  
L. Tassini ◽  
B. Muschler ◽  
R. Hackl ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Amplitude Mode
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