Anharmonicity in light scattering by optical phonons in GaAs1-xBix

Joshya, R. S.; Rajaji, V.; Narayana, Chandrabhas; Mascarenhas, Angelo; Kini, R. N.

doi:10.1063/1.4952381

Anharmonicity in light scattering by optical phonons in GaAs_1-_xBi_x

Journal Article · Wed May 25 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4952381· OSTI ID:1257752

^[1]; Rajaji, V. ^[2]; ^[2]; Mascarenhas, Angelo ^[3]; ^[1]

Indian Inst. of Science Education and Research Thiruvananthapuram (IISERTVM), Kerala (India)
Jawaharlal Nehru Center for Advanced Scientific Research (JNCASR), Bangalore (India)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

We present a Raman spectroscopic study of GaAs_1-xBi_x epilayers grown by molecular beam epitaxy. We have investigated the anharmonic effect on the GaAs-like longitudinal optical phonon mode (LO'_GaAs) of GaAs_1-xBi_x for different Bi concentrations at various temperatures. The results are analyzed in terms of the anharmonic damping effect induced by thermal and compositional disorder. We have observed that the anharmonicity increases with Bi concentration in GaAs_1-xBi_x as evident from the increase in the anharmonicity constants. Additionally, the anharmonic lifetime of the optical phonon decreases with increasing Bi concentration in GaAs_1-xBi_x.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1257752

Alternate ID(s):: OSTI ID: 1421082

Report Number(s):: NREL/JA--5K00-66640

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 20 Vol. 119; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
III-V semiconductors
Raman spectroscopy
anharmonicity constants
bismuth
crystal lattices
crystal structure
crystallographic defects
elastic scattering
epitaxy
light scattering
linewidths
phonons
red shift
thermal effects
thermoelectric effects