TITLE:
Long-Period InAs/GaSb Type-II Superlattices for Terahertz Application
AUTHORS:
Longlong Li, Jun Ni, Wen Xu
KEYWORDS:
Long-Period InAs/GaSb Type-II SLs, THz Optoelectronic Properties, THz Band-Gap and Absorption
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.17,
November
25,
2014
ABSTRACT: We present a theoretical study on the terahertz (THz) optoelectronic properties
of long-period InAs/GaSb type-II super lattices (SLs). The eight-band k·p model is used to calculate the electronic structures of such SLs and on the
basis of band structures, the Boltzmann equation approach is employed to
calculate the optical absorption coefficients for the corresponding SL systems.
It is found that long-period InAs/GaSb type-II SLs have a considerable
absorption in the THz bandwidth. By examining the dependence of THz absorption
coefficient on the InAs/GaSb layer widths, we demonstrate that with a proper
choice of InAs/GaSb layer widths, an optimized THz absorption can be achieved.
This study is pertinent to the potential application of InAs/GaSb type-II SLs
as THz photo detectors.