| STM and STS Investigations of Bi 2 Te 3 Surface |
| Sz. Winiarz a , R. Czajka a,b , S. Suto c , P. Lo¶tak d , S. Szuba a and A. Kasuya b a Faculty of Technical Physics, Poznan University of Technology Nieszawska 13A, 60-965 Poznań, Poland b Center for Interdisciplinary Research, Tohoku University Aramaki-Aza, Aoba-ku, 980-8578 Sendai, Japan c Dept. of Physics, Graduate School of Science, Tohoku University 980-8578 Sendai, Japan d University of Pardubice, Studentska 84, 53210 Pardubice, Czech Republic |
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| We carried out scanning tunneling microscopy/spectroscopy studies of Bi 2 Te 3 surface, which, to the best of our knowledge, had not been attempted so far. We got images of surface of the material in many scales from micrometers to nanometers, which showed a layered structure of Bi 2 Te 3 , with many monoatomic terraces. We found agreement between measured heights and corresponding bulk crystal structure derived from X-ray data. In nanoscale we obtained an atomic resolution. Using scanning tunneling spectroscopy we carried out examination of the electronic structure. We observed different I-V characteristics and contrast on current imaging tunneling spectroscopy maps on non equivalent terraces. The dI/dV (~ density of states) curves referred to those terraces were compared with theoretically calculated by Larson et al. density of states derived from Bi p and Te-1p orbitals. The analysis of our results allowed us to distinguish bismuth from tellurium planes. |
| DOI: 10.12693/APhysPolA.104.389 PACS numbers: 68.37.Ef, 61.48.+w |