Identification of a New Form of Electron Coupling in Bi2Sr2CaCu2O8 Superconductor by Laser-Based Angle-Resolved Photoemission

Abstract

Laser-based angle-resolved photoemission measurements with super-high resolution have been carried out on an optimally-doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$ high temperature superconductor. New high energy features at $\sim$115 meV and $\sim$150 meV, besides the prominent $\sim$70 meV one, are found to develop in the nodal electron self-energy in the superconducting state. These high energy features, which can not be attributed to electron coupling with single phonon or magnetic resonance mode, point to the existence of a new form of electron coupling in high temperature superconductors.

arXiv comment4 pages, 4 figures

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• Low-Temperature and High-Energy-Resolution Laser Photoemission Spectroscopy
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• Coexistence of Two Sharp-Mode Couplings and Their Unusual Momentum Dependence in the Superconducting State of Bi2Sr2CaCu2O8+d Superconductor Revealed by Laser-Based Angle-Resolved Photoemission
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• Doping-dependent energy scale of the low-energy band renormalization in (Bi,Pb)2(Sr,La)2CuO6+d
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• Absence of a BCS-BEC crossover in the cuprate superconductors
• Phonon origin of low energy and high energy kinks in high temperature cuprate superconductors
• Extraction of Electron Self-Energy and Gap Function in the Superconducting State of Bi_2Sr_2CaCu_2O_8 Superconductor via Laser-Based Angle-Resolved Photoemission
• Quantitative Determination of Eliashberg Function and Evidence of Strong Electron Coupling with Multiple Phonon Modes in Heavily Over doped (Bi,Pb)2Sr2CuO6
• Ubiquitous Coexisting Electron-Mode Couplings in High Temperature Cuprate Superconductors
• Origin of Kinks in Energy Dispersion of Strongly Correlated Matter
• Large momentum-dependence of the main dispersion "kink" in the high-Tc superconductor Bi2Sr2CaCu2O8+δ
• Sharp low energy feature in single-particle spectra due to forward scattering in $d$-wave cuprate superconductors
• Non-Fermi liquid scattering against an emergent Bose liquid: manifestations in the kink and other exotic quasiparticle behaviors in the normal-state cuprate superconductors
• Resolving unoccupied electronic states with laser ARPES in bismuth-based cuprate superconductors
• Doping Evolution of Nodal Band Renormalization in Bi2Sr2CuO6+d Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
• Selective Hybridization between Main Band and Superstructure Band in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Superconductor
• Crossover from inelastic magnetic scattering of Cooper pairs to spin-wave dispersion produces low-energy kink in cuprates
• Reverse process of usual optical analysis of boson-exchange superconductors: impurity effects on $s$- and $d$-wave superconductors
• High energy fluctuation spectra in cuprates from infrared optical spectroscopy
• Analysis of optical data using extended Drude model and generalized Allen's formulas
• Distinguishing Coulomb and electron-phonon interactions for massless Dirac fermions
• Electron-boson spectral density of LiFeAs obtained from optical data
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• Expansion of Momentum Space and Full 2$\pi$ Solid Angle Photoelectron Collection in Laser-Based Angle-Resolved Photoemission Spectroscopy by Applying Sample Bias
• Extended Drude model analysis of superconducting optical spectra of correlated electron systems
• Role of the upper branch of the hour-glass magnetic spectrum in the formation of the main kink in the electronic dispersion of high-T${}_{\text{c}}$ cuprate superconductors
• Quantitative Determination of the Pairing Interactions for High Temperature Superconductivity in Cuprates