Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-09-15
Physics
Condensed Matter
Other Condensed Matter
14 pages, 2 figures. Accepted for publication in Applied Physics Letters
Scientific paper
10.1063/1.2993232
We suggest to use InAs/GaSb coupled quantum wells for THz lasing. In these heterostructures THz lasing is based not on intersubband but on interband transitions. Crucial advantages of this design in comparison with intersubband lasers are (i) a large value of the interband dipole matrix element and (ii) easier maintaining of population inversion. These advantages lead to a gain of two orders of magnitude higher than for intersubband lasing. Even higher gain can be obtained in special design InAs/GaSb W-structures where a hybridization gap of 1-3THz is formed and optical density of states is singular.
Laikhtman B.
Shvartsman L. D.
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