| Title: |
A correlated insulator at the surface of the polar metal Ca$_3$Ru$_2$O$_7$ |
| Authors: |
Halliday, Daniel; Benedičič, Izidor; Zivanovic, Andela; Naritsuka, Masahiro; Edwards, Brendan; Antonelli, Tommaso; Kikugawa, Naoki; Sokolov, Dmitry A.; Polley, Craig; Mackenzie, Andrew P.; Held, Georg; King, Phil D. C.; Wahl, Peter |
| Publication Year: |
2026 |
| Collection: |
ArXiv.org (Cornell University Library) |
| Subject Terms: |
Strongly Correlated Electrons |
| Description: |
We investigate the electronic structure at the surface of the correlated oxide Ca$_3$Ru$_2$O$_7$, a low-symmetry ruthenate oxide which hosts an unconventional polar-metal phase. From a combination of angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy measurements, we demonstrate that the surface hosts an insulating phase, a distinct departure from metallicity within the bulk. Utilizing quantitative low-energy electron diffraction in conjunction with electronic structure calculations, we show how this results from a combined surface structure relaxation and the impact of marked electronic correlations in this system. Our findings highlight the proximity of Ca$_3$Ru$_2$O$_7$ to an insulating metallic state, and illustrate how subtle structural distortions can control its emergent electronic phases. ; 6 pages main text + 4 pages supplementary, 4 figures in main text, 4 in supplementary, fixed missing ',' in author list in v2 |
| Document Type: |
text |
| Language: |
unknown |
| Relation: |
http://arxiv.org/abs/2603.23657 |
| Availability: |
http://arxiv.org/abs/2603.23657 |
| Accession Number: |
edsbas.1A5D8F37 |
| Database: |
BASE |