Topological Magnon Band Crossing in Y2Ir2O7
- 주제(기타) Physics, Multidisciplinary
- 설명문(일반) [Nguyen, Thi Huyen; Son, Jaeseok; Kim, Soyeun; Cho, Hwanbeom; Kim, Choong H.; Jeong, Jaehong; Park, Je-Geun; Noh, T. W.] Inst Basic Sci IBS, Ctr Correlated Electron Syst, Seoul 08826, South Korea; [Nguyen, Thi Huyen; Son, Jaeseok; Kim, Soyeun; Cho, Hwanbeom; Kim, Choong H.; Jeong, Jaehong; Park, Je-Geun; Noh, T. W.] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea; [Wang, Y. P.; Burch, Kenneth S.] Boston Coll, Dept Phys, Boston, MA 02467 USA; [Yang, In-Sang] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Park, Je-Geun] Seoul Natl Univ, Ctr Quantum Mat, Seoul 08826, South Korea; [Moon, S. J.] Hanyang Univ, Dept Phys, Seoul 04763, South Korea; [Kim, Soyeun] Univ Illinois, Dept Phys, Urbana, IL 61801 USA; [Cho, Hwanbeom] Univ Oxford, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England
- 등재 SCIE, SCOPUS
- 발행기관 AMER PHYSICAL SOC
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000190261
- 본문언어 영어
- Published As https://doi.org/10.1103/PhysRevLett.127.267203
- PubMed https://pubmed.ncbi.nlm.nih.gov/35029465
초록/요약
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.
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