Molecular beam epitaxial growth of InAsSb strained layer superlattices. Can nature do it betterquest;

摘要

Molecular beam epitaxial growth of a normally homogeneous InAs0.5Sb0.5alloy below 430thinsp;deg;C results in its coherent phase separation into platelets of two different alloy compositions with tetragonally distorted crystal lattices. This produces a lsquo;lsquo;naturalrsquo;rsquo; strained layer superlattice (nhyphen;SLS) with clearly defined interfaces modulated in the lsqb;001rsqb; growth direction. A description of thenhyphen;SLS growth mode in InAsSb is outlined, and the optical response of anhyphen;SLS structure, which extends to 12.5 mgr;mminus;considerably further than that of a homogeneous InAs0.5Sb0.5layer (8.9 mgr;m)minus;is reported.