We demonstrate theoretically that it is possible to realize terahertz (THz) fundamental band-gap in InAs/GaSb type-II superlattices (SLs). The presence of such band-gap can result in a strong cut-off of optical absorption at THz bandwidth. This study is pertinent to the application of InAs/GaSb type-II SLs as THz photodetectors.
['L. L. Li', 'Wen Xu', 'Z. Zeng', 'A. R. Wright', 'Chao Zhang', 'J. Zhang', 'Yi Shi', 'T. C. Lu']
Terahertz band-gap in InAs/GaSb type-II superlattices