The local density of states (LDOS) of InAs/GaSb long period superlattices was investigated on the cleaved (110) surface at atomic resolution by low-temperature scanning tunneling microscopy and low-temperature scanning tunneling spectroscopy (LT-STS). We present definitive features showing the broken-gap energy band profiles (the overlap of the conduction band of the InAs and the valence band of the GaSb in energy) in the LT-STS spectra complemented by distinct, atomically resolved topographic images. Furthermore, vivid standing waves in LDOS corresponding to the single quantum well-like subband confined in the InAs layer were observed.
ASJC Scopus subject areas
- Physics and Astronomy(all)