Abstract
Correlated electron systems on a honeycomb lattice have emerged as a fertile playground to explore exotic electronic phenomena. Theoretical and experimental work has appeared to realize novel behavior, including quantum Hall effects and valleytronics, mainly focusing on van der Waals compounds, such as graphene, chalcogenides, and halides. In this article, we review our theoretical study on perovskite transition-metal oxides (TMOs) as an alternative system to realize such exotic phenomena. We demonstrate that novel quantum Hall effects and related phenomena associated with the honeycomb structure could be artificially designed by such TMOs by growing their heterostructures along the [111] crystallographic axis. One of the important predictions is that such TMO heterostructures could support two-dimensional topological insulating states. The strong correlation effects inherent to TM d electrons further enrich the behavior.
| Original language | English |
|---|---|
| Article number | 041006 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 87 |
| Issue number | 4 |
| DOIs | |
| State | Published - 2018 |
Funding
Acknowledgments The research by S.O. is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. D.X. acknowledges support by the Air Force Office of Scientific Research under Grants No. FA9550-12-1-0479. We would like to thank W. Zhu, Y. Ran, N. Nagaosa, Y. Nomura, and R. Arita for collaborations and fruitful discussions at every stage of this work.