Ideal Weyl semimetal induced by magnetic exchange
| Autor: | Timur K. Kim, J. N. Blandy, Yanfeng Guo, Yulin Chen, Matthew Bristow, Juan Jiang, Steven H. Simon, Youguo Shi, Dayu Yan, Pascal Reiss, Amalia I. Coldea, M. C. Rahn, F. de Juan, Andrew T. Boothroyd, Alix McCollam, J.-R. Soh, Maia G. Vergniory, Niels B. M. Schröter |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed matter physics Spins Strongly Correlated Electrons (cond-mat.str-el) Fermi level Weyl semimetal FOS: Physical sciences Correlated Electron Systems Fermi surface Correlated Electron Systems / High Field Magnet Laboratory (HFML) 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology 01 natural sciences Brillouin zone symbols.namesake Condensed Matter - Strongly Correlated Electrons Effective mass (solid-state physics) 0103 physical sciences symbols Quasiparticle Condensed Matter::Strongly Correlated Electrons Mathematics::Representation Theory 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B, 100 Physical Review B, 100, 20 |
| ISSN: | 2469-9950 |
| DOI: | 10.1103/physrevb.100.201102 |
| Popis: | Weyl semimetals exhibit exceptional quantum electronic transport due to the presence of topologically-protected band crossings called Weyl nodes. The nodes come in pairs with opposite chirality, but their number and location in momentum space is otherwise material specific. Following the initial discoveries there is now a need for better material realizations, ideally comprising a single pair of Weyl nodes located at or very close to the Fermi level and in an energy window free from other overlapping bands. Here we propose the layered intermetallic EuCd$_2$As$_2$ to be such a system. We show that Weyl nodes in EuCd$_2$As$_2$ are magnetically-induced via exchange coupling, emerging when the Eu spins are aligned by a small external magnetic field. The identification of EuCd$_2$As$_2$ as a model magnetic Weyl semimetal, evidenced here by ab initio calculations, photoemission spectroscopy, quantum oscillations and anomalous Hall transport measurements, opens the door to fundamental tests of Weyl physics. |
| Databáze: | OpenAIRE |
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