Unraveling of free carrier absorption for terahertz radiation in heterostructures

Details Unraveling of free carrier absorption for terahertz radiation in heterostructures Unraveling of free carrier absorption for terahertz radiation in heterostructures

2011-09-21

arxiv.org/abs/1109.4504v2

Physical Review B 84, 205319 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, accepted by Physical Review B

Scientific paper

10.1103/PhysRevB.84.205319

The relation between free carrier absorption and intersubband transitions in semiconductor heterostructures is resolved by comparing a sequence of structures. Our numerical and analytical results show how free carrier absorption evolves from the intersubband transitions in the limit of an infinite number of wells with vanishing barrier width. It is explicitly shown that the integral of the absorption over frequency matches the value obtained by the f-sum rule. This shows that a proper treatment of intersubband transitions is fully sufficient to simulate the entire electronic absorption in heterostructure THz devices.

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