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  • Possible eliashberg-type superconductivity enhancement effects in a two-band superconductor ▫$MgB_2$▫ driven by narrow-band THz pulses
    Sobolev, S. ...
    We study THz-driven condensate dynamics in epitaxial thin films of MgB2, a prototype two-band superconductor (SC) with weak interband coupling. The temperature and excitation density dependent ... dynamics follow the behavior predicted by the phenomenological bottleneck model for the single-gap SC, implying adiabatic coupling between the two condensates on the ps timescale. The amplitude of the THz-driven suppression of condensate density reveals an unexpected decrease in pair-breaking efficiency with increasing temperature—unlike in the case of optical excitation. The reduced pair-breaking efficiency of narrow-band THz pulses, displaying minimum near ≈0.7 Tc, is attributed to THz-driven, long-lived, nonthermal quasiparticle distribution, resulting in Eliashberg-type enhancement of superconductivity, competing with pair breaking.
    Vir: Physical review letters online. - ISSN 1079-7114 (Vol. 131, iss. 18, Nov. 2023, str. 186903-1- 186903-6)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 170646275

    Povezava(-e):

    https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.131.186903
    DOI

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