Electron-plasmon interaction induced plasmonic-polaron band replication in epitaxial perovskite SrIrO3 films

• 作者: Zhengtai Liu Wanling Liu Ruixiang Zhou Songhua Cai Yekai Song Qi Yao Xiangle Lu Jishan Liu Zhonghao Liu Zhen Wang Yi Zheng Peng Wang Zhi Liu Gang Li Dawei Shen
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: ARTICLES
• 页码范围: 433-440
• 页数: 8页
• 语种: 英文

摘要

Electron-boson interaction is fundamental to a thorough understanding of various exotic properties emerging in many-body physics.In photoemission spectroscopy,photoelectron emission due to photon absorption would trigger diverse collective excitations in solids,including the emergence of phonons,magnons,electron-hole pairs,and plasmons,which naturally provides a reliable pathway to study electron-boson couplings.While fingerprints of electron-phonon/-magnon interactions in this state-of-the-art technique have been well investigated,much less is known about electron-plasmon coupling,and direct observation of the band renormalization solely due to electron-plasmon interactions is extremely challenging.Here by utilizing integrated oxide molecular-beam epitaxy and angle-resolved photoemission spectroscopy,we discover the long sought-after pure electron-plasmon coupling-induced low-lying plasmonic-polaron replica bands in epitaxial semimetallic SrIrO3 films,in which the characteristic low carrier concentration and narrow bandwidth combine to provide a unique platform where the electron-plasmon interaction can be investigated kinematically in photoemission spectroscopy.This finding enriches the forms of electron band normalization on collective modes in solids and demonstrates that,to obtain a complete understanding of the quasiparticle dynamics in 5d electron systems,the electron-plasmon interaction should be considered on equal footing with the acknowledged electron-electron interaction and spin-orbit coupling.