Effect of the spin split-off band on optical absorption in p-t quantum-well infrared detectors

J. Hoff, M. Razeghi, Gail J. Brown

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Experimental investigations of p-type (Formula presented)(Formula presented)(Formula presented)(Formula presented) 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/(Formula presented)(Formula presented)As QWIP’s. Our theoretical modeling of p-type QWIP’s based on the (Formula presented)(Formula presented)(Formula presented)(Formula presented) 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/(Formula presented)(Formula presented)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/(Formula presented)(Formula presented)As QWIP, and then to a series of GaAs/(Formula presented)(Formula presented)P, GaAs/(Formula presented)(Formula presented)(Formula presented)(Formula presented), (Formula presented)(Formula presented)(Formula presented)(Formula presented)/(Formula presented)(Formula presented)P, and (Formula presented)(Formula presented)(Formula presented)(Formula presented)/(Formula presented)(Formula presented)(Formula presented) QWIP’s. Through this analysis, the insignificance of spin split-off absorption in GaAs/(Formula presented)(Formula presented)As QWIP’s is verified, as is the dual role of light-hole extended-state and spin split-off hole-extended-state absorption on the spectral shape of (Formula presented)(Formula presented)(Formula presented)(Formula presented) QWIP’s.

Original languageEnglish (US)
Pages (from-to)10773-10783
Number of pages11
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number15
DOIs
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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