Signatures of charge inhomogeneities in the infrared spectra of topological insulators Bi2Se3, Bi2Te3 and Sb2Te3
| Autor: | Hechang Lei, Sasa Dordevic, Nenad Stojilovic, Cedomir Petrovic, M. S. Wolf |
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| Rok vydání: | 2013 |
| Předmět: |
Antimony
Physics Spectrophotometry Infrared Condensed matter physics medicine.diagnostic_test Infrared Static Electricity Electric Conductivity Infrared spectroscopy Charge (physics) Condensed Matter Physics Spectral line Selenium Electrical resistivity and conductivity Spectrophotometry Topological insulator medicine General Materials Science Tellurium Bismuth Plasmon |
| Zdroj: | Journal of Physics: Condensed Matter. 25:075501 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/25/7/075501 |
| Popis: | We present the results of an infrared spectroscopy study of topological insulators Bi2Se3, Bi2Te3 and Sb2Te3. Reflectance spectra of all three materials look similar, with a well defined plasma edge. However, there are some important differences. Most notably, as temperature decreases the plasma edge shifts to lower frequencies in Bi2Se3, whereas in Bi2Te3 and Sb2Te3 it shifts to higher frequencies. In the loss function spectra we identify asymmetric broadening of the plasmon, and assign it to the presence of charge inhomogeneities. It remains to be seen if charge inhomogeneities are characteristic of all topological insulators, and whether they are of intrinsic or extrinsic nature. (Some figures may appear in colour only in the online journal) |
| Databáze: | OpenAIRE |
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