Magnetic field tuning of valley population in the Weyl phase of Nd2Ir2 O7

• Main Authors: Kapon, I. (Author), Michon, B. (Author), Nakatsuji, S. (Author), Rischau, C.W (Author), Van Der Marel, D. (Author), Wang, K. (Author), Xu, B. (Author), Yang, Q. (Author)
• Format: Article
• Language: English
• Published: American Physical Society 2022
• Subjects: Binary alloys; Electronic band; External magnetic field; Frustrated magnet; Landforms; Localised; Lower energies; Magnetic fields; Magnetic-field; Optical spectroscopy; Orbits; Rare earths; Rare-earths; Spin-orbit couplings; Strong correlation
• Online Access: View Fulltext in Publisher
• ISBN: 26431564 (ISSN)
• DOI: 10.1103/PhysRevResearch.4.023056

The frustrated magnet Nd2Ir2O7, where strong correlations together with spin-orbit coupling play a crucial role, is predicted to be a Weyl semimetal and to host topological pairs of bulk Dirac-like valleys. Here we use an external magnetic field to manipulate the localized rare-earth 4f moments coupled to the 5d electronic bands. Low-energy optical spectroscopy reveals that a field of only a few teslas suffices to create charge-compensating pockets of holes and electrons in different regions of momentum space, thus introducing a valley population shift that can be tuned with the field. © 2022 authors. Published by the American Physical Society.