Abstract-Magnetic-field assisted performance of InGaAs/GaAsSb terahertz quantum cascade lasers

Simon Maëro¹, Louis-Anne de Vaulchier¹, Yves Guldner¹,Christoph Deutsch², Michael Krall², Tobias Zederbauer³,Gottfried Strasser³, and Karl Unterrainer^{2
http://apl.aip.org/resource/1/applab/v103/i5/p051116_s1?isAuthorized=no&}

We report on a magnetic-field investigation of a In_0.53Ga_0.47As/GaAs_0.51Sb_0.49terahertz quantum cascade laser. Owing to the suppression of inter-Landau level non-radiative scattering, the device performances are strongly improved at high magnetic field. Working temperature up to 190 K and current threshold of 450 A/cm² are measured at 11 T, comparable to the state-of-the-art GaAs/AlGaAs terahertz lasers. The nominally symmetric three-well structure presents significantly better performance with negative bias polarisation because of the inverted-interface roughness impact on the laser action.

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