Abstract
InAs/In(As,Sb) type-II superlattices are of increasing interest for their practical advantages in device applications, particularly IR detection. This comparative study of highest-quality superlattices grown by different techniques and groups establishes the utility of Raman spectroscopy as an efficient, nondestructive technique for characterizing these systems. It also provides a unified understanding of the mechanism of the appearance of forbidden optical-phonon modes in four quite different categories of superlattices, and even bulk alloys with unintended structural modulations.
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