Physics – Condensed Matter – Materials Science
Scientific paper
2010-03-24
Appl. Phys. Lett., 96, 153103 (2010)
Physics
Condensed Matter
Materials Science
13 pages, 2 tables, 3 figures; to be presented at MRS Spring Meeting, 2010
Scientific paper
We report results of micro-Raman spectroscopy investigation of the "graphene-like" mechanically exfoliated single-crystal bismuth telluride films with the thickness ranging from a few-nm-range to bulk limit. It is found that the optical phonon mode A1u, which is not-Raman active in bulk bismuth telluride crystals, appears in the atomically-thin films due to crystal-symmetry breaking. The intensity ratios of the out-of-plane A1u and A1g modes to the in-plane Eg mode grow with decreasing film thickness. The evolution of Raman signatures with the film thickness can be used for identification of bismuth telluride crystals with the thickness of few-quintuple layers, which are important for topological insulator and thermoelectric applications.
Balandin Alexander A.
Hossain Zakir Md.
Shahil Khan M. F.
Teweldebrhan Desalegne
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