Record link: 
http://hdl.handle.net/20.500.12708/142088
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Title: 
Multi‐Center Magnon Excitations Open the Entire Brillouin Zone to Terahertz Magnetometry of Quantum Magnets
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Citation: 
Biesner, T., Roh, S., Razpopov, A., Willwater, J., Süllow, S., Li, Y., Zoch, K. M., medarde, marisa, Nuss, J., Gorbunov, D., Skourski, Y., Pustogow, A., Brown, S. E., Krellner, C., Valentí, R., Puphal, P., & Dressel, M. (2022). Multi‐Center Magnon Excitations Open the Entire Brillouin Zone to Terahertz Magnetometry of Quantum Magnets. Advanced Quantum Technologies, 5(6), Article 2200023. https://doi.org/10.1002/qute.202200023
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Publisher DOI: 
10.1002/qute.202200023
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Biesner, Tobias 
Roh, Seulki 
Razpopov, Aleksandar 
Willwater, Jannis 
Süllow, Stefan 
Li, Ying 
Zoch, Katharina M. 
medarde, marisa 
Nuss, Jürgen 
Gorbunov, Denis 
Skourski, Yurii 
Pustogow, Andrej 
Brown, Stuart E. 
Krellner, Cornelius 
Valentí, Roser 
Puphal, Pascal 
Dressel, Martin 
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Organisational Unit: 
E138-03 - Forschungsbereich Functional and Magnetic Materials 
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Journal: 
Advanced Quantum Technologies 
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ISSN: 
2511-9044
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Date (published): 
25-Mar-2022
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Publisher: 
WILEY
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Peer reviewed: 
Yes
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Keywords: 
kagome lattices; multi-center magnons; terahertz magnetometry; terahertz photons
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Abstract: 
Due to the small photon momentum, optical spectroscopy commonly probes magnetic excitations only at the center of the Brillouin zone; however, there are ways to override this restriction. In case of the distorted kagome quantum magnet Y-kapellasite, Y3Cu9(OH)19Cl8, under scrutiny here, the spin (magnon) density of states (SDOS) can be accessed over the entire Brillouin zone through three-center magnon excitations. This mechanism is aided by the three different magnetic sublattices and strong short-range correlations in the distorted kagome lattice. The results of THz time-domain experiments agree remarkably well with linear spin-wave theory (LSWT). Relaxing the conventional zone-center constraint of photons gives a new aspect to probe magnetism in matter.
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Project (external): 
Deutsche Forschungsgemeinschaft (DFG)
China Postdoctoral Science Foundation
National Natural Science Foundation of China
Swiss National Science Foundation
Alexander von Humboldt Foundation
National Science Foundation (USA)
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Project ID: 
TRR 288- 422213477 (project A05)
2019M660249
12004296
206021_139082
2004553
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Research Areas: 
Materials Characterization: 50%
Quantum Many-body Systems Physics: 50%
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Science Branch: 
1030 - Physik, Astronomie: 100%
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