Large acoustic impedance mismatch in CdTe/MgTe nanodevices

Bernard Jusserand (1) , R. Ghasemi (1) , E. Dynowska , M. Wiater , G. Karczewski (2) , T. Wojtowicz (2)

1 INSP - Institut des Nanosciences de Paris
2 Institute of Physics

From a Raman scattering investigation of folded longitudinal acoustic phonons in zinc-blende CdTe/MgTe superlattices, we demonstrate that this pair of materials displays a large acoustic impedance mismatch Z(1)/Z(2)=1.39, which opens promising perspectives for acoustic phonon engineering in semiconductor nanodevices. The determined MgTe sound velocity s=(3.35 +/- 0.15)x10(3) m/s agrees well with ab initio predictions for the same crystalline form.

Mots clés: acoustic wave velocity; cadmium compounds; II-VI semiconductors; magnesium compounds; nanoelectronics; phonons; Raman spectra; semiconductor superlattices

Domaines: Matière Condensée [cond-mat]

Bernard Jusserand, R. Ghasemi, E. Dynowska, M. Wiater, G. Karczewski, et al.. Large acoustic impedance mismatch in CdTe/MgTe nanodevices. Applied Physics Letters, 2009, 94 (9), ⟨10.1063/1.3089847⟩. ⟨hal-01229236⟩