Second-harmonic (SH) rotation anisotropy measurements have been performed for the first time on epitaxial CMT layers grown on CdTe〈1 1 1〉 B substrate. The CMT response shows a strong surface contribution to the SH signal. This modification of the SH response from a non-centrosymmetric II–VI material has not been previously reported since bulk SH generation has always been considered as the dominant contributor in these instances. The difference in the case of the CMT however is that the observed SH signal orginates from, at most, only the top 30 nm of the CMT epilayer.
- second harmonic generation
- epitaxial CdxHg1-xTe (CMT) (111) surfaces