Raman scattering from (110) Hg0.8Cd0.2Te.

We report the first polarization dependent Raman scattering from the (1$\text{1}$0) surface of Hg_0.8Cd_0.2Te. In addition to the “HgTe-like” and “CdTe-like” transverse and longitudinal $\text{(}\text{q}\text{=0)}$ optical modes, we have observed a “clustering mode” [Γ₁ symmetry], a feature due to a coupled LO phonon-intersubband excitation in the surface inversion layer and a symmetry forbidden TO feature which may be related to internal strain. The previously reported “defect mode” was not observed.