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Unusual 209Bi NMR quadrupole effects in topological insulator Bi2Se3.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Guehne, Robin Chlan, Vojtěch Williams, Grant V. M. Chong, Shen V. Kadowaki, Kazuo Pöppl, Andreas Haase, Jürgen |
| Copyright Year | 2019 |
| Abstract | Three-dimensional topological insulators are an important class of modern materials, and a strong spin-orbit coupling is involved in making the bulk electronic states very different from those near the surface. Bi2Se3 is a model compound, and 209Bi NMR is employed here to investigate the bulk properties of the material with focus on the quadrupole splitting. It will be shown that this splitting measures the energy band inversion induced by spin-orbit coupling in quantitative agreement with first-principle calculations. Furthermore, this quadrupole interaction is very unusual as it can show essentially no angular dependence, e.g., even at the magic angle the first-order splitting remains. Therefore, it is proposed that the magnetic field direction is involved in setting the quantization axis for the electrons, and that their life time leads to a new electronically driven relaxation mechanism, in particular for quadrupolar nuclei like 209Bi. While a quantitative understanding of these effects cannot be given, the results implicate that NMR can become a powerful tool for the investigation of such systems. |
| Starting Page | 34 |
| Ending Page | 42 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.jmr.2019.03.008 |
| PubMed reference number | 30953924 |
| Journal | Medline |
| Volume Number | 302 |
| Alternate Webpage(s) | https://arxiv.org/pdf/1904.07938v1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.jmr.2019.03.008 |
| Journal | Journal of magnetic resonance |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
