2019
DOI: 10.1038/s41566-019-0470-y
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Lightwave-driven gapless superconductivity and forbidden quantum beats by terahertz symmetry breaking

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Cited by 124 publications
(157 citation statements)
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References 31 publications
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“…As a consequence, for broadband pulses the spectral components of δE probe (t pp ) are dominated by the characteristic frequency of the mode, ω osc = ω res , while for narrowband pulses δE probe (t pp ) oscillates at twice the pump frequency, ω osc = 2Ω pump , with an amplitude K(2Ω pump ) maximized when 2Ω pump = ω res . These expectations match rather well the observations reported so far in several SC systems [4][5][6][7][8] . From the theoretical point of view, establishing such a general paradigm provides also a scheme for further theoretical investigations aimed at linking the experimental observations to the properties of the underlying microscopic model.…”
supporting
confidence: 92%
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“…As a consequence, for broadband pulses the spectral components of δE probe (t pp ) are dominated by the characteristic frequency of the mode, ω osc = ω res , while for narrowband pulses δE probe (t pp ) oscillates at twice the pump frequency, ω osc = 2Ω pump , with an amplitude K(2Ω pump ) maximized when 2Ω pump = ω res . These expectations match rather well the observations reported so far in several SC systems [4][5][6][7][8] . From the theoretical point of view, establishing such a general paradigm provides also a scheme for further theoretical investigations aimed at linking the experimental observations to the properties of the underlying microscopic model.…”
supporting
confidence: 92%
“…While the frequency of the SC oscillations is well captured by the parabolic-band approximation (35) for the non-linear kernel, their long-time decay depends crucially on the band-structure details. This can be again understood by relying on the general equation (8) for the transmitted probe field. In the case of a broadband pulse, and setting for simplicity t g = 0, we can safely approximate the long-time behavior of δE probe (t pp ) with the time dependence on the non-linear kernel K(t):…”
Section: Pump-probe Spectroscopy Of Superconducting Modesmentioning
confidence: 99%
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“…Such THz photon driven coherence mechanism complements the spontaneous symmetry protection mechanism in the ground state. However, its observation requires intense THz pump and THz conductivity probe spectroscopy measurements [18][19][20][21][22] of the coherent phonon-dressed TPS, which has never been demonstrated so far.…”
Section: Introductionmentioning
confidence: 99%
“…Specifically, free oscillations of the Higgs mode, with its characteristic frequency of 2Δ, can be launched by an ultrashort terahertz pulse quenching the free energy of the order parameter 9 . Alternatively, it could also be periodically driven at 2ω through nonlinear coupling between the electromagnetic vector potential A(ω) and the superconducting condensate [10][11][12] . The resulting free (driven) Higgs oscillation manifests itself in terahertz transmissivity as an oscillation at 2Δ (2ω).…”
mentioning
confidence: 99%