|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms
This item is licensed under:Creative Commons Attribution 4.0 International
| Title: | Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms |
| Authors: | Nobukane, Hiroyoshi Browse this author | | Matsuyama, Toyoki Browse this author | | Tanda, Satoshi Browse this author |
| Issue Date: | 23-Jan-2017 |
| Publisher: | Nature Publishing Group |
| Journal Title: | Scientific reports |
| Volume: | 7 |
| Start Page: | 41291 |
| Publisher DOI: | 10.1038/srep41291 |
| Abstract: | The quantum anomaly that breaks the symmetry, for example the parity and the chirality, in the quantization leads to a physical quantity with a topological Chern invariant. We report the observation of a Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms by employing electric transport. We observed the superconductor-to-insulator transition by reducing the thickness of Sr2RuO4 single crystals. The appearance of a gap structure in the insulating phase implies local superconductivity. Fractional quantized conductance was observed without an external magnetic field. We found an anomalous induced voltage with temperature and thickness dependence, and the induced voltage exhibited switching behavior when we applied a magnetic field. We suggest that there was fractional magnetic-field-induced electric polarization in the interlayer. These anomalous results are related to topological invariance. The fractional axion angle Theta = pi/6 was determined by observing the topological magneto-electric effect in the Bose-insulating phase of Sr2RuO4 nanofilms. |
| Rights: | http://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/64666 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 延兼 啓純
|
