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 Bi<sub>2</sub>Sr<sub>2</sub>Cu<sub>2</sub>O<sub>8</sub>+Δ, Physical Review Letters
(Accessed October 5, 2024)
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Laser Based Angle-Resolved Photoemission, the Sudden Approximation and Quasiparticle-Like Spectral Peaks in Bi2Sr2Cu2O8+Δ
Published
Author(s)
j D. Koralek, , N C. Plumb, Z Sun, A V. Fedorov, M M. Murnane, H C. Kapteyn, , 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 Tc superconductor Bid2^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
Issues
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Created October 12, 2021