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(Color online) (a) Schematic conduction band diagram and squared wave functions of one QCS period under an applied electric field. The radiative transition occurs between the first excited state and the fundamental state of the thick quantum well. Electrons are injected into via the injector level . The grey shaded regions correspond to the injection and extraction minibands. (b) Zero magnetic field electroluminescence spectra at a current density of for the mesa (plain line) and the ridge (dashed line) devices. The temperature is 4.5 K. Inset: schematic of the QCS with the specific processing to block intersubband emission with a polarization .
(Color online) (a) Voltage as a function of the magnetic field at constant current density for the mesa device. (b) Plot of the LLs and . Two elastic scattering mechanisms are displayed: electron-electron interaction (red arrows) and interface roughness (green circles).
(Color online) Emission spectra for different magnetic field from B = 4.7 to 12.0 T at fixed current density . The resolution is 1.2 meV and the temperature is 4.5 K.
(Color online) Emission peak energy at different magnetic field and fixed current density. Error bars are due to the experimental resolution of our spectra (1.2 meV). Red squares correspond to the cyclotron emission peaks. The black squares correspond to disorder activated forbidden transitions. The grey areas are proportional to the number of injected electrons in the LLs as deduced from the experimental transport data of Figure 2(a).
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