Tamosiunas, V.Zobl, R.Fasching, G.Ulrich, J.Strasser, G.Unterrainer, K.Colombelli, R.Gmachl, C.West, K.Pfeiffer, L.Capasso, F.2019-09-172004Tamosiunas, V, R Zobl, G Fasching, J Ulrich, G Strasser, K Unterrainer, R Colombelli, et al. 2004. “Magnetic Field Effects in Terahertz Quantum-Cascade Lasers.” Semiconductor Science and Technology 19 (4): S348–50. https://doi.org/10.1088/0268-1242/19/4/115.0268-12421361-6641http://nrs.harvard.edu/urn-3:HUL.InstRepos:41372688We have measured the emission intensity and spectra of terahertz quantum-cascade lasers in an external magnetic field applied normal to the epilayers. We have observed a reduction of the threshold current, an enhancement of laser emission intensity and shifts of the emission line. A wider operating range was predicted for the selected waveguide design according to our finite-difference time-domain simulation results. The intensity enhancement and the threshold current reduction are attributed to the suppression of nonradiative Auger-intersubband transitions by Landau quantization of the in-plane electron motion, to the modulation of the injection rate via resonant inter-Landau-level transfer, and to the modulation of waveguide properties.en-USJournal Article2019-09-1710.1088/0268-1242/19/4/115