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

Simon Maëro (1) , Louis-Anne de Vaulchier (1) , Yves Guldner (1) , Christoph Deutsch (2) , Michael Krall (2) , Tobias Zederbauer (3) , Gottfreid Strasser (3) , Karl Unterrainer (2)

1 LPA - Laboratoire Pierre Aigrain
2 IPF - Institut fur Photonik und Festkoerperelectronik
3 Institute for Solid State Electronics

We report on a magnetic-field investigation of a In0:53Ga0:47As=GaAs0:51Sb0:49 terahertz 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 190K and current threshold of 450A=cm2 are measured at 11 teslas, 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.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Simon Maëro, Louis-Anne de Vaulchier, Yves Guldner, Christoph Deutsch, Michael Krall, et al.. Magnetic-field assisted performance of InGaAs/GaAsSb terahertz quantum cascade lasers. Applied Physics Letters, 2013, pp.051116. ⟨hal-00911496⟩