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  Real-time dynamics of angular momentum transfer from spin to acoustic chiral phonon in oxide heterostructures

Choi, I. H., Jeong, S. G., Song, S., Park, S., Shin, D., Choi, W. S., et al. (2024). Real-time dynamics of angular momentum transfer from spin to acoustic chiral phonon in oxide heterostructures. Nature Nanotechnology, 19(9), 1277-1282. doi:10.1038/s41565-024-01719-w.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-935B-5 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-D9DA-7
Genre: Journal Article

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Supplementary information & Source data: Supplementary Information: Supplementary Figs. 1–22 and Discussion. (pdf); Source data: Source Data Fig. 1: Raw data in Fig. 1c. (xlsx); Source Data Fig. 2: Raw data in Fig. 2. (xlsx); Source Data Fig. 3: Raw data in Fig. 3. (xlsx)
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 Creators:
Choi, I. H.1, Author
Jeong, S. G.2, Author
Song, S.3, Author
Park, S.3, Author
Shin, D.1, 4, 5, Author           
Choi, W. S.2, Author
Lee, J. S.1, Author
Affiliations:
1Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), ou_persistent22              
2Department of Physics, Sungkyunkwan University, ou_persistent22              
3Department of Physics, Pusan National University, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
5Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: Chiral phonons have recently been explored as a novel degree of freedom in quantum materials. The angular momentum carried by these quasiparticles is generated by the breaking of chiral degeneracy of phonons, owing to the chiral lattice structure or the rotational motion of ions of the material. In ferromagnets, a mechanism for generating non-equilibrium chiral phonons has been suggested, but their temporal evolution, which obeys Bose–Einstein statistics, remains unclear. Here we report the real-time dynamics of thermalized chiral phonons in an artificial superlattice composed of ferromagnetic metallic SrRuO3 and non-magnetic insulating SrTiO3. Following the photo-induced ultrafast demagnetization in the SrRuO3 layer, we observed the appearance of a magneto-optic signal in the superlattice, which is absent in the SrRuO3 single films. This magneto-optic signal exhibits thermally driven dynamic properties and a clear correlation with the thickness of the non-magnetic SrTiO3 layer, implying that it originates from thermalized chiral phonons. We use numerical calculations considering the magneto-elastic coupling in SrRuO3 to validate our experimental observations and the angular momentum transfer mechanism between the lattice and spin systems in ferromagnetic systems and also to the non-magnetic system.

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Language(s): eng - English
 Dates: 2023-10-052024-06-122024-07-122024-09-09
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41565-024-01719-w
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Project name : J.S.L. and I.H.C. acknowledge the support from the Korea government (MSIT) number 2022R1A2C2007847 and 2022M3H4A1A04074153. S.G.J. acknowledges the support from the Korea government (MSIT) number 2022R1C1C2006723. S.P. and S.S. acknowledge the support from the Korea government (MSIT) number RS-2023-00221154. D.B.S. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) number RS-2023-00241630 and the National Supercomputing Center with supercomputing resources including technical support (KSC-2023-CRE0073). W.S.C. and S.G.J. acknowledge the support from the Korea government (MSIT) numbers 2021R1A2C2011340 and RS-2023-00220471.
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Title: Nature Nanotechnology
  Other : Nat. Nanotechnol.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 19 (9) Sequence Number: - Start / End Page: 1277 - 1282 Identifier: ISSN: 1748-3387
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000239770