Selective Control of Electric Charge of Weyl Fermions in Pyrochlore Iridates.

Autor: Shen S; Department of Physics, University of Science and Technology of China, Hefei, 230026, China.; State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China., Oh T; RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan., Song J; Department of Physics and Astronomy, Seoul National University (SNU), Seoul, 08826, Republic of Korea., Tian D; State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China., Shu X; State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China., Zhang Y; State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China., Zhang F; State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China., Yi D; State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China., Noh TW; Department of Physics and Astronomy, Seoul National University (SNU), Seoul, 08826, Republic of Korea., Yang BJ; Department of Physics and Astronomy, Seoul National University (SNU), Seoul, 08826, Republic of Korea.; Center for Theoretical Physics (CTP), Seoul National University, Seoul, 08826, Republic of Korea.; Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea., Li Y; School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China., Yu P; State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China.; Frontier Science Center for Quantum Information, Beijing, 100084, China.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Dec; Vol. 36 (49), pp. e2403306. Date of Electronic Publication: 2024 Oct 17.
DOI: 10.1002/adma.202403306
Abstrakt: 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 2 Ir 2 O 7 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.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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