Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate
superconductor
- URL: http://arxiv.org/abs/2109.13229v1
- Date: Mon, 27 Sep 2021 17:59:42 GMT
- Title: Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate
superconductor
- Authors: Denitsa R. Baykusheva, Hoyoung Jang, Ali A. Husain, Sangjun Lee,
Sophia F. R. TenHuisen, Preston Zhou, Sunwook Park, Hoon Kim, Jinkwang Kim,
Hyeong-Do Kim, Minseok Kim, Sang-Youn Park, Peter Abbamonte, B. J. Kim, G. D.
Gu, Yao Wang, Matteo Mitrano
- Abstract summary: We use time-resolved x-ray absorption spectroscopy to demonstrate the light-induced renormalization of the Hubbard $U$ in a cuprate superconductor.
We show that intense femtosecond laser pulses induce a substantial redshift of the upper Hubbard band, while leaving the Zhang-Rice singlet energy unaffected.
Our demonstration of a dynamical Hubbard $U$ renormalization in a copper oxide paves the way to a novel strategy for the manipulation of superconductivity, magnetism, as well as to the realization of other long-range-ordered phases in light-driven quantum materials.
- Score: 8.775772298435337
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: 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, La$_{1.905}$Ba$_{0.095}$CuO$_4$. 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 a $\sim140$ meV reduction
of the onsite 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, magnetism, as well as
to the realization of other long-range-ordered phases in light-driven quantum
materials.
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