Band-selective Holstein polaron in Luttinger liquid material A0.3MoO3 (A = K, Rb)

L. Kang, X. Du, J. S. Zhou, X. Gu, Y. J. Chen, R. Z. Xu, Q. Q. Zhang, S. C. Sun, Z. X. Yin, Y. W. Li, D. Pei, J. Zhang, R. K. Gu, Z. G. Wang, Z. K. Liu, R. Xiong, J. Shi, Y. Zhang, Y. L. Chen () and L. X. Yang ()
Additional contact information
L. Kang: Tsinghua University
X. Du: Tsinghua University
J. S. Zhou: Tsinghua University
X. Gu: Tsinghua University
Y. J. Chen: Tsinghua University
R. Z. Xu: Tsinghua University
Q. Q. Zhang: Tsinghua University
S. C. Sun: Tsinghua University
Z. X. Yin: Tsinghua University
Y. W. Li: ShanghaiTech University and CAS-Shanghai Science Research Center
D. Pei: University of Oxford
J. Zhang: ShanghaiTech University and CAS-Shanghai Science Research Center
R. K. Gu: University of Oxford
Z. G. Wang: Peking University
Z. K. Liu: ShanghaiTech University and CAS-Shanghai Science Research Center
R. Xiong: Wuhan University
J. Shi: Wuhan University
Y. Zhang: Peking University
Y. L. Chen: Tsinghua University
L. X. Yang: Tsinghua University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract (Quasi-)one-dimensional systems exhibit various fascinating properties such as Luttinger liquid behavior, Peierls transition, novel topological phases, and the accommodation of unique quasiparticles (e.g., spinon, holon, and soliton, etc.). Here we study molybdenum blue bronze A0.3MoO3 (A = K, Rb), a canonical quasi-one-dimensional charge-density-wave material, using laser-based angle-resolved photoemission spectroscopy. Our experiment suggests that the normal phase of A0.3MoO3 is a prototypical Luttinger liquid, from which the charge-density-wave emerges with decreasing temperature. Prominently, we observe strong renormalizations of band dispersions, which are recognized as the spectral function of Holstein polaron derived from band-selective electron-phonon coupling in the system. We argue that the strong electron-phonon coupling plays an important role in electronic properties and the charge-density-wave transition in blue bronzes. Our results not only reconcile the long-standing heavy debates on the electronic properties of blue bronzes but also provide a rare platform to study interesting excitations in Luttinger liquid materials.

Date: 2021
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DOI: 10.1038/s41467-021-26078-1

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