Raman tensor elements and Faust-Henry coefficients of wurtzite-type α-GaN: How to overcome the dilemma of the sign of Faust-Henry coefficients in α-GaN?


Faust-Henry coefficients are ratios describing the relative influence of lattice displacements and electric field onto the electric susceptibility. They are essential in order to access the charge carrier concentration as well as the mobility of polar semiconductors by Raman scattering from measured frequencies, bandwidths, and intensities of coupled phonon-plasmon modes. In the case of α-GaN only the Faust-Henry coefficient connected with the Raman tensor elements aTO and aLO of the axial modes has been reported with differing results and questionable sign. However, according to its wurtzite structure, in hexagonal GaN three Faust-Henry coefficients associated with phonon modes of different symmetry exist. In the present study, from Raman scattering efficiencies of corresponding transverse optical and longitudinal optical phonons which are accessible in different scattering configurations, Raman tensor elements, and respective Faust-Henry coefficients were deduced. It is shown that near-forward scattering of phonon-polaritons, depending on frequency, allows the unambiguous determination of the sign of Faust-Henry coefficients. In case of α-GaN the obtained Faust-Henry coefficients connected with the corresponding Raman tensor elements are CaFH=−3.46, CbFH=−3.81, and CcFH=−2.31.

Did you like this research project?

To get this research project Guidelines, Training and Code... Click Here

PROJECT TITLE : Improving Spatial Resolution of Raman DTS Using Total Variation Deconvolution ABSTRACT: Ancient Raman distributed optical sensor (DTS) exhibits an occasional-pass characteristic that causes sharp temperature
PROJECT TITLE :Raman Crosstalk Suppression in NG-PON2 Using Optimized Spectral ShapingABSTRACT:In this paper, we gift an innovative proposal to mitigate the impact of Raman crosstalk within the interaction between NG-PON2 TWDM-PON
PROJECT TITLE :Characterisation of Raman distributed temperature sensor using deconvolution algorithmsABSTRACT:The behaviour of distributed temperature sensors based mostly on spontaneous Raman scattering using deconvolution algorithm
PROJECT TITLE :A Fast Classification Scheme in Raman Spectroscopy for the Identification of Mineral Mixtures Using a Large Database With Correlated PredictorsABSTRACT:Sturdy classification methods are vital to the successful implementation
PROJECT TITLE :Theoretical and Experimental Study on the Intracavity Optical Parametric Oscillator Pumped in a Raman LaserABSTRACT:A rate-equation-based model is established to describe the behavior of an intracavity optical parametric

Ready to Complete Your Academic MTech Project Work In Affordable Price ?

Project Enquiry