Dynamic control of electron correlations in photodoped charge-transfer insulators

The electronic properties of correlated insulators are governed by the strength of Coulomb interactions, enabling the control of electronic conductivity with external stimuli. This work highlights that the strength of electronic correlations in nickel oxide (NiO), a prototypical charge-transfer insulator, can be coherently reduced by tuning the intensity of an optical pulse excitation. This weakening of correlations persists for hundreds of picoseconds and exhibits a recovery time independent of photodoping density across two orders of magnitude. A broadening of the charge-transfer gap is also observed, consistent with dynamical screening. The high degree of control achieved over both the energy and temporal dynamics of electronic correlations offers a promising avenue to a full optical control of correlated systems and the Mott transition.

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Publication Details

Journal
Science Advances
Published
2025-09-05
DOI
https://doi.org/10.1126/sciadv.adx5676
Primary Topic
Advanced Memory and Neural Computing
Type
article
Field-Weighted Citation Impact
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article

Dynamic control of electron correlations in photodoped charge-transfer insulators

Rajesh V. Chopdekar, Renske M. van der Veen, Arnaud Magrez, Nicolas Tancogne-Dejean et al.
Science Advances
Advanced Memory and Neural Computing
article

Dynamic control of electron correlations in photodoped charge-transfer insulators

Rajesh V. Chopdekar, Renske M. van der Veen, Arnaud Magrez, Nicolas Tancogne-Dejean, Thomas Rossi, Majed Chergui, Yayoi Takamura, Ángel Rubio, Malte Oppermann, U. Staub, M. Porer
article en

Abstract

The electronic properties of correlated insulators are governed by the strength of Coulomb interactions, enabling the control of electronic conductivity with external stimuli. This work highlights that the strength of electronic correlations in nickel oxide (NiO), a prototypical charge-transfer insulator, can be coherently reduced by tuning the intensity of an optical pulse excitation. This weakening of correlations persists for hundreds of picoseconds and exhibits a recovery time independent of photodoping density across two orders of magnitude. A broadening of the charge-transfer gap is also observed, consistent with dynamical screening. The high degree of control achieved over both the energy and temporal dynamics of electronic correlations offers a promising avenue to a full optical control of correlated systems and the Mott transition.

Science AdvancesVol. 11(36)
Universität Hamburg (DE), University of Basel (CH), Helmholtz-Zentrum Berlin für Materialien und Energie (DE), Paul Scherrer Institute (CH), Elettra-Sincrotrone Trieste S.C.p.A. (IT), Simons Foundation (US), Max Planck Institute for the Structure and Dynamics of Matter (DE), École Polytechnique Fédérale de Lausanne (CH), University of California, Davis (US)
Openalex Percentile: Top 77%
Advanced Memory and Neural Computing
DOIOpen Access PDFOpenAlex
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Dynamic control of electron correlations in photodoped charge-transfer insulators — Rajesh V. Chopdekar, Renske M. van der Veen, et al. · Science Advances (2025) | TGRS Research Map | TGRS