Identifying the Background Signal in ARPES of High Temperature Superconductors
A. Kaminski, S. Rosenkranz, H. M. Fretwell, J. Mesot, M. Randeria, J., C. Campuzano, M. R. Norman, Z. Z. Li, H. Raffy, T. Sato, T. Takahashi, K., Kadowaki
TL;DR
This paper investigates the origin of background signals in ARPES spectra of high-temperature superconductors, attributing them to extrinsic scattering, and introduces an analytical method for background subtraction.
Contribution
It identifies the extrinsic nature of the background signal and proposes a new analytical technique for its removal in ARPES data analysis.
Findings
Background signal is extrinsic and due to strong scattering of photoelectrons.
The proposed method effectively subtracts the background from ARPES spectra.
Enhances the accuracy of interpreting ARPES data in high-Tc superconductors.
Abstract
One of the interesting features of the photoemission spectra of the high temperature cuprate superconductors is the presence of a large signal (referred to as the "background'') in the unoccupied region of the Brillouin zone. Here we present data indicating that the origin of this signal is extrinsic and is most likely due to strong scattering of the photoelectrons. We also present an analytical method that can be used to subtract the background signal.
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