Articles written in Pramana – Journal of Physics
Volume 41 Issue 1 July 1993 pp 21-29
Effect of strain on vibrational modes in strained layer superlattices
We have investigated the lattice vibrational properties of a two-component strained layer semiconductor superlattice (GaAs)
Volume 45 Issue 1 July 1995 pp 25-32
Phonon dispersion in quasiperiodic semiconductor superlattices
Sujata Rath Prafulla K Jha Sankar P Sanyal
The phonon spectra of unstrained and strained quasiperiodic semiconductor superlattices (QSSL) have been calculated using one-dimensional linear chain model. We consider two types of quasiperiodic systems, namely cantor triadic bar (CTB) and Fibonacci sequences (FS), constituting of AlAs, GaAs and GaSb of which the latter two have a lattice mismatch of about 7%. The calculations have been made using transfer matrix method and also with and without the inclusion of strain. We present the results on phonon spectra of two component CTB and two as well as three component FS semiconductor superlattices (SSL), thickness and order dependence on LO mode of GaAs, effect of strain on LO frequency of GaAs. The calculated results show that the strain generated due to lattice mismatch reduces significantly the magnitudes of the confined optical phonon frequency of GaAs.
Volume 49 Issue 5 November 1997 pp 547-553 Brief Reports
Phonon dispersion in aluminium arsenide and antimonide
Prafulla K Jha Sujata Rath Sankar P Sanyal
The phonon dispersion curves for aluminium arsenide and antimonide have been investigated by using a deformation bond approximation model. The results obtained from this model are compared with the experimental values wherever it is available. Since there is no complete experimental phonon dispersion curves for AlAs, we could not compare our calculated results, but the results of AlSb have been compared with the inelastic neutron scattering measurements at 15 K. However, we compare the phonon frequencies of AlAs and AlSb at critical points of the Brillouin zone obtained by our calculations and Raman spectroscopy measurements. This model predicts the phonon modes satisfactorily in all the symmetry directions of the Brillouin zone (BZ). The spectrum has similar features as observed in other III–V compound semiconductors.
Volume 97, 2023
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