Dr Paul Kinsler. [Acknowledgements & Feedback]

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Coupling of polar optical phonons to electrons in superlattices and isolated quantum wells

*copied*

<>   JN: SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 1992, Vol.7, No.3B, pp.B 52-B
<>       59   
<>   IS: 0268-1242 
<>   AB: Theoretical models that treat optical lattice vibrations in        
<>       heterostructures by viewing the lattice-matched crystalline media as
<>       isotropic homogeneous continua separated by smooth planar interfaces,
<>       offer conceptual simplicity and are, without doubt, computationally 
<>       advantageous when calculations involving electron-phonon interactions
<>       are carried out. The two (apparently conflicting) continuum models, 
<>       namely the hydrodynamic (HD) and the electromagnetic (EM) models, are
<>       discussed, their calculational frameworks in the context of
<>       semiconductor heterostructures examined and some of their predictions
<>       displayed. A statement of the HD model in terms of a polariton subset
<>       plus an LO subset is given, and this permits a transparent comparison
<>       with the EM model to be made. It is then shown that the EM model is a
<>       non-dispersive, non-retarded and subsequently mishandled version of
<>       the polariton subset of the HD model and it completely disallows   
<>       proper considerations of longitudinal optical modes. The sources of
<>       the current controversies concerning HD versus EM boundary
<>       conditions-confined mode identification, existence of localized alloy
<>       interface LO modes and interface FK modes, Frohlich-type coupling e-
<>       PHI together with the e-phi versus - (e/m*c)A(T).p couplings to      
<>       electrons-are all pointed out and discussed. A close agreement      
<>       between some very recent predictions of the two models concerning    
<>       interface mode contributions to energy relaxation is explained and  
<>       this helps to clarify the nature of the conflict regarding other  
<>       contributions. Further evidence in support of the HD model from
<>       recent theoretical and experimental results is pointed out.          

cf Ridley-B-1991

Longitudinal solutions are LO-phonons; transverse solutions are TO-phonons and IP-phonons -- these are phonon-polaritons.

XINDEX: phonon-polariton, boundary-condition, TO-phonon, LO-phonon, IP-phonon, HD-model, DC-model, index-file, log-file.

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