【摘 要】
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Electron-boson interaction is fundamental to a thorough understanding of various exotic properties emerging in many-body physics.In photoemission spectroscopy,p
【机 构】
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State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and
论文部分内容阅读
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.
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