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Updated: Aug 2, 2025

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K_{3}C_{60}
J Steven Dodge1, Leya Lopez1, Derek G Sahota1
1Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
Abstract:
We discuss a systematic error in time-resolved optical conductivity measurements that becomes important at high pump intensities. We show that common optical nonlinearities can distort the photoconductivity depth profile, and by extension distort the photoconductivity spectrum. We show evidence that this distortion is present in existing measurements on K_{3}C_{60}, and describe how it may create the appearance of photoinduced superconductivity where none exists. Similar errors may emerge in other pump-probe spectroscopy measurements, and we discuss how to correct for them.
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