The importance of spin-orbit coupling to the electronic structure
Event details
| Date | 01.03.2011 |
| Hour | 14:00 |
| Speaker | Prof. Andrea Damascelli, University of British Columbia, Vancouver, CA. |
| Location | |
| Category | Conferences - Seminars |
The Fermi surface of Sr2RuO4 was studied by a wide variety of probes, establishing this material as the first complex oxide for which the de Haas-van Alphen bulk transport technique and surface-sensitive angleresolved photoemission spectroscopy (ARPES) have arrived at a precise quantitative agreement. This result resolved was obtained by exploiting temperature as an empirical cleaving parameter in suppressing the photoemission intensity associated with the reconstructed surface of the material. On the basis of STM experiments, we have been able to show that this is a consequence of a temperature-dependent increase in the surface density of defects at the mesoscopic scale, and might be used as an effective mean to gain bulk-representative information by ARPES on unstable oxide surfaces. By comparing these bulk ARPES results to first-principle calculations, we provide evidence for the importance of spin-orbit coupling effects. Subtle Fermi surface modifications are observed whenever the bands are nearly degenerate; most importantly, however, spin-orbit coupling induces a strong momentum dependence, normal to the RuO2 planes, for both orbital and spin character. These findings have profound implications for the understanding of unconventional superconductivity in Sr2RuO4.
Practical information
- Informed public
- Free
Organizer
- ICMP
Contact
- Prof. Dr Fabrizio Carbone