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Coupling of Higgs and Leggett modes in non-equilibrium superconductors

Author

Listed:
  • H. Krull

    (Lehrstuhl für Theoretische Physik I, Technische Univerität Dortmund)

  • N. Bittner

    (Max-Planck-Institut für Festkörperforschung)

  • G. S. Uhrig

    (Lehrstuhl für Theoretische Physik I, Technische Univerität Dortmund)

  • D. Manske

    (Max-Planck-Institut für Festkörperforschung)

  • A. P. Schnyder

    (Max-Planck-Institut für Festkörperforschung)

Abstract

In equilibrium systems amplitude and phase collective modes are decoupled, as they are mutually orthogonal excitations. The direct detection of these Higgs and Leggett collective modes by linear-response measurements is not possible, because they do not couple directly to the electromagnetic field. In this work, using numerical exact simulations we show for the case of two-gap superconductors, that optical pump–probe experiments excite both Higgs and Leggett modes out of equilibrium. We find that this non-adiabatic excitation process introduces a strong interaction between the collective modes, which is absent in equilibrium. Moreover, we propose a type of pump–probe experiment, which allows to probe and coherently control the Higgs and Leggett modes, and thus the order parameter directly. These findings go beyond two-band superconductors and apply to general collective modes in quantum materials.

Suggested Citation

  • H. Krull & N. Bittner & G. S. Uhrig & D. Manske & A. P. Schnyder, 2016. "Coupling of Higgs and Leggett modes in non-equilibrium superconductors," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11921
    DOI: 10.1038/ncomms11921
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    Cited by:

    1. SeongJin Kwon & Hyunjin Jung & SangJin Lee & Gil Young Cho & KiJeong Kong & ChoongJae Won & Sang-Wook Cheong & Han Woong Yeom, 2024. "Dual Higgs modes entangled into a soliton lattice in CuTe," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    2. Bin Hu & Hui Chen & Yuhan Ye & Zihao Huang & Xianghe Han & Zhen Zhao & Hongqin Xiao & Xiao Lin & Haitao Yang & Ziqiang Wang & Hong-Jun Gao, 2024. "Evidence of a distinct collective mode in Kagome superconductors," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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