Nanoscale Probing of Local Electrical Characteristics on MBE-Grown Bi2Te3 Surfaces under Ambient Conditions
| Autor: | S. E. Harrison, Tatiana S. Dorofeeva, James S. Harris, Rita Macedo, Richard A. Kiehl |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Mechanical Engineering Bioengineering Nanotechnology General Chemistry Conductive atomic force microscopy Condensed Matter Physics Coupling (electronics) Condensed Matter::Materials Science chemistry.chemical_compound chemistry Chemical physics Topological insulator General Materials Science Bismuth telluride Graphite Current (fluid) Nanoscopic scale Molecular beam epitaxy |
| Zdroj: | Nano Letters. 15:4241-4247 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | The local electrical characteristics on the surface of MBE-grown Bi2Te3 are probed under ambient conditions by conductive atomic force microscopy. Nanoscale mapping reveals a 10–100× enhancement in current at step-edges compared to that on terraces. Analysis of the local current–voltage characteristics indicates that the transport mechanism is similar for step-edges and terraces. Comparison of the results with those for control samples shows that the current enhancement is not a measurement artifact but instead is due to local differences in electronic properties. The likelihood of various possible mechanisms is discussed. The absence of enhancement at the step-edges for graphite terraces is consistent with the intriguing possibility that spin–orbit coupling and topological effects play a significant role in the step-edge current enhancement in Bi2Te3. |
| Databáze: | OpenAIRE |
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