In:
MRS Proceedings, Springer Science and Business Media LLC, Vol. 291 ( 1992-01-01)
Abstract:
Bi 1- x Sb x alloys undergo a semimetal-semiconductor transition at x = 0.065 and 0.22 and are semiconducting between these limits. We investigate this system by means of femtosecond time-resolved experiments, and observe an optical response similar to those in Bi, Sb, Te and Ti 2 O 3 . A previously-reported model describes the mechanism of generation of coherent lattice vibrations via the optically excited carriers in this class of materials. As predicted by the model, the modulated reflectivity signal Δ R/R in Bi .88 Sb .12 shows a beating oscillatory behavior with the Bi-Bi and Bi-Sb A 1 g vibrational frequencies. Model-based calculations of the ΔR background relaxation time at different Sb compositions provide understanding of the carrier and lattice dynamics throughout the transition.
Type of Medium:
Online Resource
ISSN:
0272-9172
,
1946-4274
DOI:
10.1557/PROC-291-413
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1992
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