Effect of the spin split-off band on optical absorption in p-type quantum-well infrared detectors
- 15 October 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 54 (15), 10773-10783
- https://doi.org/10.1103/physrevb.54.10773
Abstract
Experimental investigations of p-type quantum-well intersubband photodetectors (QWIP’s) led to the discovery of unique features in photoresponse spectra of these devices. In particular, the strong 2–5-μm photoresponse of these QWIP’s was not anticipated based on previous experimental and theoretical results for p-type GaAs/ As QWIP’s. Our theoretical modeling of p-type QWIP’s based on the system revealed that the intense short-wavelength photoresponse was due to a much stronger coupling to the spin-orbit split-off components in the continuum than occurs for GaAs/ As QWIP’s. Due to the strong influence of the spin split-off band, an eight-band Kane Hamiltonian was required to accurately model the measured photoresponse spectra. This theoretical model is first applied to a standard p-type GaAs/ As QWIP, and then to a series of GaAs/ P, GaAs/ , / P, and
Keywords
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