journal article·2015-08-01Open access

Vibrational properties of epitaxial Bi4Te3 films as studied by Raman spectroscopy

Hao Xu, Yuxin Song, Wenwu Pan, Qimiao Chen, Xiaoyan Wu, Pengfei Lu, Qian Gong, Shumin Wang

AIP Advances· Volume 5· Issue 8

Abstract

Bi4Te3, as one of the phases of the binary Bi–Te system, shares many similarities with Bi2Te3, which is known as a topological insulator and thermoelectric material. We report the micro-Raman spectroscopy study of 50 nm Bi4Te3 films on Si substrates prepared by molecular beam epitaxy. Raman spectra of Bi4Te3 films completely resolve the six predicted Raman-active phonon modes for the first time. Structural features and Raman tensors of Bi4Te3 films are introduced. According to the wavenumbers and assignments of the six eigenpeaks in the Raman spectra of Bi4Te3 films, it is found that the Raman-active phonon oscillations in Bi4Te3 films exhibit the vibrational properties of those in both Bi and Bi2Te3 films.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Thermoelectric Materials and Devices · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Chinese Academy of Sciences 1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, , 865 Changning Road, Shanghai 200050, China

University of Chinese Academy of Sciences 2 , No.19A Yuquan Road, Beijing 100049, China

Beijing University of Posts and Telecommunications 3 State Key Laboratory of Information Photonics and Optical Communications, Ministry of Education, , P.O. Box 72, Beijing 100876, China

Chalmers University of Technology 4 Department of Microtechnology and Nanoscience, , 41296 Gothenburg, Sweden

Funding

creative research group project of natural science foundation of China · key program of natural science foundation of China · key research program of the Chinese academy of sciences · national basic research program of China · Shanghai Pujiang Program · strategic priority research program of the Chinese academy of sciences · National Natural Science Foundation of China

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