Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvl..93w7403s&link_type=abstract
Physical Review Letters, vol. 93, Issue 23, id. 237403
Physics
37
Electroluminescence, Semiconductor Lasers, Laser Diodes, Field Effect Devices, Far Infrared
Scientific paper
A terahertz quantum cascade laser, operating at λ=159 μm and exploiting the in-plane confinement arising from perpendicular magnetic field, is used to investigate the physics of electrons confined on excited subbands in the regime of a large ratio of the magnetic field confinement energy to the photon energy. As the magnetic field is increased above about 6T, and the temperature lowered below 20K, the devices are characterized by a very low threshold current density, with values as low as Jth=1A/cm2, and an increase of gain by five times the low field value. We show that, as with the quantum Hall effect, the key physical process is the localization of the carriers. Evidences for resonant electron-electron scattering processes are directly obtained from light intensity and transport measurements.
Beere Harvey
Blaser Stéphane
Davies Giles
Faist Jérôme
Linfield Edmund
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