Resolving unoccupied electronic states with laser ARPES in bismuth-based cuprate superconductors

Abstract

Angle-resolved photoemission spectroscopy (ARPES) is typically used to study only the occupied electronic band structure of a material. Here we use laser-based ARPES to observe a feature in bismuth-based superconductors that, in contrast, is related to the unoccupied states. Specifically, we observe a dispersive suppression of intensity cutting across the valence band, which, when compared with relativistic one-step calculations, can be traced to two final-state gaps in the bands 6 eV above the Fermi level. This finding opens up possibilities to bring the ultra-high momentum resolution of existing laser-ARPES instruments to the unoccupied electron states. For cases where the final-state gap is not the object of study, we find that its effects can be made to vanish under certain experimental conditions.

arXiv comment5 pages, 4 figures

References in corpus (12)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
• Development of a Vacuum Ultra-Violet Laser-Based Angle-Resolved Photoemission System with a Super-High Energy Resolution Better Than 1 meV
• Importance of matrix elements in the ARPES spectra of BISCO
• Identification of a New Form of Electron Coupling in Bi2Sr2CaCu2O8 Superconductor by Laser-Based Angle-Resolved Photoemission
• Matrix element effects in angle-resolved photoemission from Bi2212: Energy and polarization dependencies, final state spectrum, spectral signatures of specific transitions and related issues
• Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy
• Evolution of Mid-gap States and Residual 3-Dimensionality in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Unmasking the nodal quasiparticle dynamics in cuprate superconductors using low-energy photoemission
• Structure of BSCCO supermodulation from ab initio calculations
• The high-energy anomaly in ARPES spectra of the cuprates-many body or matrix element effect?
• Origin of the photoemission final-state effects in Bi2Sr2CaCu2O8 by very-low-energy electron diffraction

Cited by in corpus (8)

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• 3D nature of ZrTe${}_5$ band structure measured by high-momentum-resolution photoemission spectroscopy
• Revealing the Coulomb interaction strength in a cuprate superconductor
• Robustness of the charge-ordered phases in IrTe${}_2$ against photoexcitation
• Time-resolved ARPES on cuprates: Tracking the low-energy electrodynamics in the time domain
• Ab initio description of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ electronic structure
• Interplay of superconductivity and bosonic coupling in the peak-dip-hump structure of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Interlayer Coupling Induced Quasiparticles