Polarization dependent photocurrent spectroscopy for identification of quantum confined interband transitions in type‐II InAs/GaSb superlattices

We report on the use of polarization sensitive photocurrent spectroscopy for identifying the participating transitions in type-II superlattices based on InAs/GaSb system. Prominent features in measured transverse magnetic and transverse electric photocurrent response on photodetectors have been analyzed to unambiguously predict the correct ordering of hole minibands as heavy and light hole minibands. Measurements carried out on both midwave infrared as well as long wave infrared superlattice detectors reveal the order of the participating valence minibands as: heavy-hole1, light-hole1and light-hole2, with the increasing energy. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)