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Topological Magnon Band Crossing in Y2Ir2O7
- Title
- Topological Magnon Band Crossing in Y2Ir2O7
- Authors
- Nguyen, Thi Huyen; Son, Jaeseok; Kim, Soyeun; Cho, Hwanbeom; Kim, Choong H.; Wang, Y. P.; Burch, Kenneth S.; Yang, In-Sang; Jeong, Jaehong; Park, Je-Geun; Moon, S. J.; Noh, T. W.
- Ewha Authors
- 양인상
- SCOPUS Author ID
- 양인상
- Issue Date
- 2021
- Journal Title
- PHYSICAL REVIEW LETTERS
- ISSN
- 0031-9007
1079-7114
- Citation
- PHYSICAL REVIEW LETTERS vol. 127, no. 26
- Publisher
- AMER PHYSICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Topological magnonic materials have attracted much interest because of the potential for dissipationless spintronic applications. Pyrochlore iridates are theoretically regarded as good candidates for designing topological magnon bands. However, experimental identification of topological magnon bands in pyrochlore iridates remains elusive. We explored this possibility in Y2Ir2O7 using Raman spectroscopy to measure both the single-magnon excitations and anomalous phonon shifts. From the single-magnon energies and tight-binding model calculations concerning the phonons, we determined the key parameters in the spin Hamiltonian. These confirm that Y2Ir2O7 hosts a nontrivial magnon band topology distinct from other pyrochlore iridate compounds. Our work demonstrates that pyrochlore iridates constitute a system in which the magnon band topology can be tailored and that Raman spectroscopy is a powerful technique to explore magnon band topology.
- DOI
- 10.1103/PhysRevLett.127.267203
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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