Band-selective Holstein polaron in Luttinger liquid material A<sub>0.3</sub>MoO<sub>3</sub> (A = K, Rb).
Lili Kang, Xian Du, J. S. Zhou, Xu Gu, Y. J. Chen, Runzhe Xu, Q. Q. Zhang, Shuo Sun, Z. X. Yin, Yiwei Li, Ding Pei, Jing Zhang, Renyuan Gu, Zhengguo Wang, Zhongkai Liu, Rui Xiong, Jiao Shi, Yan Zhang, Yulin Chen, Lexian Yang
Abstract
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.