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원자제어 저차원 전자계 연구단
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Ultrafast Renormalization of the On-Site Coulomb Repulsion in a Cuprate Superconductor

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Title
Ultrafast Renormalization of the On-Site Coulomb Repulsion in a Cuprate Superconductor
Author(s)
Baykusheva, Denitsa R.; Jang, Hoyoung; Husain, Ali A.; Lee, Sangjun; Tenhuisen, Sophia F. R.; Zhou, Preston; Sunwook Park; Hoon Kim; Jin-Kwang Kim; Kim, Hyeong-Do; Kim, Minseok; Park, Sang-Youn; Abbamonte, Peter; B. J. Kim; Gu, G.D.; Wang, Yao; Mitrano, Matteo
Publication Date
2022-03
Journal
Physical Review X, v.12, no.1
Publisher
American Physical Society
Abstract
© 2022 authors. Published by the American Physical Society.Ultrafast lasers are an increasingly important tool to control and stabilize emergent phases in quantum materials. Among a variety of possible excitation protocols, a particularly intriguing route is the direct light engineering of microscopic electronic parameters, such as the electron hopping and the local Coulomb repulsion (Hubbard U). In this work, we use time-resolved x-ray absorption spectroscopy to demonstrate the light-induced renormalization of the Hubbard U in a cuprate superconductor, La1.905Ba0.095CuO4. We show that intense femtosecond laser pulses induce a substantial redshift of the upper Hubbard band while leaving the Zhang-Rice singlet energy unaffected. By comparing the experimental data to time-dependent spectra of single- and three-band Hubbard models, we assign this effect to an approximately 140-meV reduction of the on-site Coulomb repulsion on the copper sites. Our demonstration of a dynamical Hubbard U renormalization in a copper oxide paves the way to a novel strategy for the manipulation of superconductivity and magnetism as well as to the realization of other long-range-ordered phases in light-driven quantum materials.
URI
https://pr.ibs.re.kr/handle/8788114/11262
DOI
10.1103/PhysRevX.12.011013
ISSN
2160-3308
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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