Far-infrared emission and Stark-cyclotron resonances in a quantum-cascade structure based on photon-assisted tunneling transition

Abstract

Intersubband electroluminescence has been investigated in a quantum cascade structure based on a photon-assisted tunneling transition designed for far-infrared emission. Transport measurements in the presence of a strong magnetic field perpendicular to the layers have been performed showing a strong increase of the lifetime increasing the magnetic field. In addition, Stark-cyclotron resonances were observed when the $n=0\mathrm{}$ Landau level of an excited state is resonant with a Landau level of higher index of the lower state. Finally, good agreement was found between the electronic spectrum derived by the spectral characterization of the luminescence and the location of the Stark-cyclotron resonances in the transport data.