Epitaxial Growth of BaTiO3/SrTiO3 and BaO/SrTiO3 Superlattices for Phonon Confinement

A. SOUKIASSIAN; N. D. LANZILLOTTI-KIMURA; A. BRUCHHAUSEN; A. FAINSTEIN; A. CROS; A. CANTARERO; H. P. SUN; X. Q. PAN; W. TIAN; D. A. TENNE; X. X. XI; D. G. SCHLOM

Baltimore, MD, USA

Conferencia; Annual March Meeting American Physical Society (APS); 2006

We discuss the design and material parameters of BaTiO3/SrTiO3 and BaO/SrTiO3 heterostructures relevant for novel phonon devices, including mirrors, ¯lters, and cavities for coherent phonon generation and control. The advantages of using these ferroelectric superlattices include that they have an enormous stop band compared to the GaAs/AlAs superlattices previously reported for this application and that there can be greatly ampli¯ed light-sound interaction in these ferroelectric materials. We have grown BaTiO3/SrTiO3 and BaO/SrTiO3 superlattices on TiO2-terminated SrTiO3 substrates by reactive MBE. Structural characterization by XRD and TEM revealed that the samples studied are of high quality with nearly atomically abrupt interfaces. We have observed folded acoustic phonons at the expected frequencies using UV Raman spectroscopy.