Non-equilibrium Green's function calculation of AlGaAs-well-based and GaSb-based terahertz quantum cascade laser structures
- National Institute of Information and Communications Technology, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795 (Japan)
We investigate the performance of terahertz quantum cascade lasers (THz-QCLs) based on Al{sub x}Ga{sub 1−x}As/Al{sub y}Ga{sub 1−y}As and GaSb/AlGaSb material systems to realize higher-temperature operation. Calculations with the non-equilibrium Green's function method reveal that the AlGaAs-well-based THz-QCLs do not show improved performance, mainly because of alloy scattering in the ternary compound semiconductor. The GaSb-based THz-QCLs offer clear advantages over GaAs-based THz-QCLs. Weaker longitudinal optical phonon–electron interaction in GaSb produces higher peaks in the spectral functions of the lasing levels, which enables more electrons to be accumulated in the upper lasing level.
- OSTI ID:
- 22395746
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ALUMINIUM ARSENIDES
ELECTRON-PHONON COUPLING
ELECTRONS
EQUILIBRIUM
GALLIUM ANTIMONIDES
GALLIUM ARSENIDES
GREEN FUNCTION
OPERATION
PERFORMANCE
PHONONS
SCATTERING
SEMICONDUCTOR MATERIALS
SPECTRAL FUNCTIONS
X-RAY SPECTROSCOPY
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ALUMINIUM ARSENIDES
ELECTRON-PHONON COUPLING
ELECTRONS
EQUILIBRIUM
GALLIUM ANTIMONIDES
GALLIUM ARSENIDES
GREEN FUNCTION
OPERATION
PERFORMANCE
PHONONS
SCATTERING
SEMICONDUCTOR MATERIALS
SPECTRAL FUNCTIONS
X-RAY SPECTROSCOPY