Non-equilibrium longitudinal and transverse optical phonons in terahertz quantum cascade lasers
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We report on the experimental observation of non-equilibrium longitudinal (LO) and interface transverse-like (IF-TO) optical phonons populations associated with electron transport in resonant-phonon THz quantum-cascade lasers. The measured LO-phonon occupation numbers are in excellent agreement with the result of Monte Carlo simulations at a phonon in-plane wave number q = 4.2 × 10[superscript +4] cm[superscript −1], and they remain about 40% larger than the IF-TO ones.
Date issued
2012-02Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Vitiello, Miriam S., Rita C. Iotti, Fausto Rossi, Lukas Mahler, Alessandro Tredicucci, Harvey E. Beere, David A. Ritchie, Qing Hu, and Gaetano Scamarcio. “Non-Equilibrium Longitudinal and Transverse Optical Phonons in Terahertz Quantum Cascade Lasers.” Appl. Phys. Lett. 100, no. 9 (2012): 091101. © 2012 American Institute of Physics
Version: Final published version
ISSN
00036951
1077-3118