Fermion–boson many-body interplay in a frustrated kagome paramagnet

J.-X. Yin (), Nana Shumiya, Sougata Mardanya, Qi Wang, Songtian S. Zhang, Hung-Ju Tien, Daniel Multer, Yuxiao Jiang, Guangming Cheng, Nan Yao, Shangfei Wu, Desheng Wu, Liangzi Deng, Zhipeng Ye, Rui He, Guoqing Chang, Zhonghao Liu, Kun Jiang, Ziqiang Wang, Titus Neupert, Amit Agarwal, Tay-Rong Chang, Ching-Wu Chu, Hechang Lei and M. Zahid Hasan ()
Additional contact information
J.-X. Yin: Princeton University
Nana Shumiya: Princeton University
Sougata Mardanya: National Cheng Kung University
Qi Wang: Renmin University of China
Songtian S. Zhang: Princeton University
Hung-Ju Tien: National Cheng Kung University
Daniel Multer: Princeton University
Yuxiao Jiang: Princeton University
Guangming Cheng: Princeton University
Nan Yao: Princeton University
Shangfei Wu: Chinese Academy of Sciences
Desheng Wu: Chinese Academy of Sciences
Liangzi Deng: University of Houston
Zhipeng Ye: Texas Tech University
Rui He: Texas Tech University
Guoqing Chang: Princeton University
Zhonghao Liu: Chinese Academy of Sciences
Kun Jiang: Boston College
Ziqiang Wang: Boston College
Titus Neupert: University of Zurich
Amit Agarwal: Indian Institute of Technology Kanpur
Tay-Rong Chang: National Cheng Kung University
Ching-Wu Chu: University of Houston
Hechang Lei: Renmin University of China
M. Zahid Hasan: Princeton University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Kagome-nets, appearing in electronic, photonic and cold-atom systems, host frustrated fermionic and bosonic excitations. However, it is rare to find a system to study their fermion–boson many-body interplay. Here we use state-of-the-art scanning tunneling microscopy/spectroscopy to discover unusual electronic coupling to flat-band phonons in a layered kagome paramagnet, CoSn. We image the kagome structure with unprecedented atomic resolution and observe the striking bosonic mode interacting with dispersive kagome electrons near the Fermi surface. At this mode energy, the fermionic quasi-particle dispersion exhibits a pronounced renormalization, signaling a giant coupling to bosons. Through the self-energy analysis, first-principles calculation, and a lattice vibration model, we present evidence that this mode arises from the geometrically frustrated phonon flat-band, which is the lattice bosonic analog of the kagome electron flat-band. Our findings provide the first example of kagome bosonic mode (flat-band phonon) in electronic excitations and its strong interaction with fermionic degrees of freedom in kagome-net materials.

Date: 2020
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DOI: 10.1038/s41467-020-17464-2

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