Coupling of Higgs and Leggett modes in non-equilibrium superconductors

H. Krull, N. Bittner, G. S. Uhrig, D. Manske and A. P. Schnyder ()
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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

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11921

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DOI: 10.1038/ncomms11921

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