Laser Based Angle-Resolved Photoemission, the Sudden Approximation and Quasiparticle-Like Spectral Peaks in Bi2Sr2Cu2O8+Δ

Published

October 12, 2021

Author(s)

j D. Koralek, Jack F. Douglas, N C. Plumb, Z Sun, A V. Fedorov, M M. Murnane, H C. Kapteyn, Steven T. Cundiff, Y Aiura, K Oka, H. Eisaki, D S. Dessau

Abstract

A new low photon energy regime of angle-resolved photoemission spectroscopy is accessed with lasers and used to study the hight T_{c superconductor Bi}d2^CaCu₂O₈d+^delta. The low energy increases bulk sensitivity, reduces background, and improves resolution. With this we observe spectral peaks which are sharp on the scale of their binding energy-the clearest evidence yet for quasiparticles in the normal state. Crucial aspects of the data such as the dispersion, superconducting gaps, and the bosonic coupling kink are foind to be robust to a possible breakdown of the sudden approximation.

Citation

Physical Review Letters

Pub Type

Journals

Keywords

photoemission, superconductors, ultrafast

Citation

Koralek, J. , Douglas, J. , Plumb, N. , Sun, Z. , Fedorov, A. , Murnane, M. , Kapteyn, H. , Cundiff, S. , Aiura, Y. , Oka, K. , Eisaki, H. and Dessau, D. (2021), Laser Based Angle-Resolved Photoemission, the Sudden Approximation and Quasiparticle-Like Spectral Peaks in Bi₂Sr₂Cu₂O₈+Δ, Physical Review Letters (Accessed April 18, 2024)