Selective Control of Electric Charge of Weyl Fermions in Pyrochlore Iridates
Weyl fermions can exhibit exotic phenomena due to their magnetic charge in momentum space, while Weyl nodes are usually located away from Fermi energy, which forms electron or hole pockets as the electric charges. Previous studies have mostly focused on the magnetic charge, however, the electric charges are rarely explored. Here, the intriguing Hall responses arising from the interplay between magnetic and electric charges of Weyl fermions in pyrochlore iridates are reported. Explicitly, unexpected linear scaling is observed between the anomalous Hall conductivity and Hall carrier density in strained Nd<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub> thin films, and its slope shows a sign change approaching the Néel temperature of Nd. Theoretical calculations unveil that the cluster magnetic multipoles induce local energy inversion of Weyl nodes, which alters the electric charge of Weyl fermions and accounts for the observed nontrivial Hall responses. Moreover, the correlation between the magnetic and electric charges is further probed by voltage-controlled hydrogenation, which leads to the suppression of the anomalous Hall effect through electron filling. This work not only reveals the essential role of the both magnetic and electric charges of Weyl fermions, but also demonstrates the hydrogenation as an effective tuning knob in exploring correlated topological properties.
Authors
- Di Yi (ORCID: https://orcid.org/0000-0002-7209-1947)
- Xinyu Shu (ORCID: https://orcid.org/0009-0009-6992-8513)
- Tae Won Noh (ORCID: https://orcid.org/0000-0003-1905-2321)
- Taekoo Oh (ORCID: https://orcid.org/0000-0001-7481-7556)
- Shengchun Shen (ORCID: https://orcid.org/0000-0002-7307-2473)
- Pu Yu (ORCID: https://orcid.org/0000-0002-5513-7632)
- Bohm‐Jung Yang (ORCID: https://orcid.org/0000-0001-5888-7546)
- Yang Zhang (ORCID: https://orcid.org/0000-0003-1684-6273)
- Yangyang Li (ORCID: https://orcid.org/0000-0003-4469-0659)
- Fan Zhang (ORCID: https://orcid.org/0000-0002-3658-9887)
- Di Tian (ORCID: https://orcid.org/0000-0002-0389-8683)
- Jeongkeun Song
Institutions
- University of Science and Technology of China (CN)
- Seoul National University (KR)
- Shandong University (CN)
- RIKEN Center for Emergent Matter Science (JP)
- Beijing Academy of Quantum Information Sciences (CN)
- State Key Laboratory of New Ceramics and Fine Processing
- State Key Laboratory of Crystal Materials
- Tsinghua University (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2024-10-17
- DOI
- https://doi.org/10.1002/adma.202403306
- Citations
- 3
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 0.93
Funders
- Shandong University
- Taishan Scholar Foundation of Shandong Province
- Grains Research and Development Corporation
- National Research Foundation
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- National Research Foundation of Korea
- Tsinghua University
- Natural Science Foundation of Shandong Province
- Ministry of Science and ICT, South Korea
- Samsung Science and Technology Foundation
- Samsung
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities