scholarly journals Acoustic Phonons in Nanowires with Embedded Heterostructures

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Hussein M. Ayedh ◽  
Andreas Wacker
Keyword(s):  
Continuum Model ◽  
Phonon Dispersion ◽  
Dispersion Relations ◽  
Structure Parameters ◽  
Acoustic Phonons ◽  
Elastic Continuum ◽  
Isotropic Approximation ◽  
Different Types ◽  
The Impact ◽  
Phonon Dispersion Relations

Acoustic phonons are studied in finite nanowires based on the elastic continuum model. The phonon dispersion relations are compared for different types of approximations both for pure nanowires and nanowire heterostructures including cubic and wurtzite materials. We find that the isotropic approximation highly underestimates the frequency of torsional modes. The impact of heterostructures on the lowest modes is rather weak and can be described by an average of the different structure parameters.

Anharmonic Lifetime of Phonons in Nanophononic Semiconductors

2009 ◽  
Vol 1172 ◽  
Author(s):  
Steven Hepplestone ◽  
Gyaneshwar P Srivastava
Keyword(s):  
Continuum Model ◽  
Phonon Dispersion ◽  
Golden Rule ◽  
Dispersion Relations ◽  
Phonon Modes ◽  
Rule Based ◽  
Fermi's Golden Rule ◽  
Mass Factor ◽  
Phonon Dispersion Relations ◽  
Fermi’S Golden Rule

AbstractWe present a theory of three-phonon interactions in nanophononic semiconductors at 300˜K. The intrinsic lifetime of phonon modes is estimated from the application of Fermi's Golden Rule, based on realistic phonon dispersion relations and a quasi-continuum model for the cubic anharmonicity. We show that the lifetime of phonon modes in the Si(0.543˜nm)/- Ge(0.543˜nm)[100] superlattice is shorter than the average of results for bulk Si and Ge. This is explained in terms of the availability of additional decay routes and an additional Dual Mass factor which arises due the different densities of Si and Ge.

Phonon Dispersion Relations in the Bi0.95Sb0.05 Alloy

1981 ◽  
Vol 104 (1) ◽  
pp. 97-102 ◽  
Author(s):  
J. Sosnowski ◽  
S. Bednarski ◽  
W. Bührer ◽  
A. Czachor ◽  
E. Maliszewski
Keyword(s):  
Phonon Dispersion ◽  
Dispersion Relations ◽  
Phonon Dispersion Relations
Sign in / Sign up

Export Citation Format

Share Document