Abstract
Thermal transport in superlattices is governed by various phonon-scattering processes. For extracting the phonon-scattering contribution of hetero-interfaces in chalcogenide superlattices, single-crystalline Bi2Se3/In2Se3 (BS/IS) superlattices with minimized defects are prepared on fluorophlogopite mica by molecular beam epitaxy. The cross-plane heat-conducting properties of the BS/IS superlattices are demonstrated to depend precisely on the period thicknesses and constituents of the superlattices, where a minimum in the thermal conductivity indicates a crossover from particle-like to wave-like phonon transport in the superlattices. The thermal-conductivity minimum of the BS/IS superlattices is nearly one order of magnitude lower than that of intrinsic BS film.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (Nos. 11104010, 61474014, and 51272038), Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics (No. 20120910), and the National Basic Research Program of China (No. 2013CB933301).
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Ren, W., Li, H., Gao, L. et al. Epitaxial growth and thermal-conductivity limit of single-crystalline Bi2Se3/In2Se3 superlattices on mica. Nano Res. 10, 247–254 (2017). https://doi.org/10.1007/s12274-016-1282-8
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DOI: https://doi.org/10.1007/s12274-016-1282-8