Anomaly at Delta_k in the ARPES spectrum of dirty superconductors
T. Dahm, P. J. Hirschfeld, L. Zhu, and D. J. Scalapino
TL;DR
This paper discusses how elastic forward scattering causes an anomaly in ARPES spectra of dirty superconductors, enabling measurement of the superconducting gap away from the Fermi surface.
Contribution
It introduces a method to determine the superconducting gap Delta_k at non-Fermi surface k values using ARPES anomalies caused by elastic forward scattering.
Findings
Elastic forward scattering induces detectable anomalies in ARPES spectra.
The anomaly can be used to measure the superconducting gap Delta_k.
Provides a new approach for gap measurement away from the Fermi surface.
Abstract
Elastic forward scattering can lead to an anomaly in the ARPES spectrum of the cuprate superconductors. Here we discuss how this anomaly can be used to provide a measurement of the superconducting gap Delta_k for k values away from the Fermi surface.
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