Interface Adhesion and Structural Characterization of Rolled-up GaAs/In_0.2Ga_0.8As Multilayer Tubes by Coherent Phonon Spectroscopy.

ABSTRACT: We present a detailed experimental and theoretical study of the acoustic phonon modes in rolled-up multilayers with thickness of the layers in the nanometre and diameters in the micrometre range. We compare our results to planar, unrolled multilayers grown by molecular beam epitaxy. For the planar multilayers the experimentally obtained acoustic modes exhibit properties of a superlattice and match well to calculations obtained by the Rytov model. The rolled-up superlattice tubes show intriguing differences compared to the planar structures which can be attributed to the imperfect adhesion between individual tube windings. A transfer matrix method including a massless spring accounting for the imperfect adhesion between the layers yields good agreement between experiment and calculations fo

SUBMITTER: Brick D 

PROVIDER: S-EPMC5511180 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature