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  • Letter
  • Open Access

Radiative Higgs mode in photoinduced η pairs

Satoshi Ejima1,2 and Benedikt Fauseweh3,4

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Phys. Rev. B 112, L121103 – Published 5 September, 2025

DOI: https://doi.org/10.1103/v1jr-vhfr

Abstract

We demonstrate that the η symmetry of the pump-induced η-pairing state in the Hubbard chain can be transiently broken by an additionally applied probe pulse. This leads to characteristic dynamic Higgs oscillations of the η-pair correlations during the probe pulse and a sharp dynamic negative optical conductivity σ(ω;t), which appears above the equilibrium Mott gap ω>Δc, long after the pump pulse is finished. This negative peak in the real part of σ(ω;t) is a distinctive hallmark of the photoinduced η-pairing state, distinguishing it from parameter regimes dominated by incoherent doublon formation, which do not exhibit this feature. Remarkably, the broadband probe pulse then leads to the emission of photons with the Higgs frequency.

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Phys. Rev. B 112, L121103– Published 5 September, 2025
  • Received 6 September 2024
  • Revised 15 August 2025
  • Accepted 20 August 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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