Polarization-resolved terahertz third-harmonic generation in a single-crystal superconductor NbN: Dominance of the Higgs mode beyond the BCS approximation

Recent advances in time-domain terahertz (THz) spectroscopy have unveiled that resonantly enhanced strong THz third-harmonic generation (THG) mediated by the collective Higgs amplitude mode occurs in s-wave superconductors, where charge-density fluctuations (CDFs) have been shown to also contribute...

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Veröffentlicht in:	Physical review. B 2017-07, Vol.96 (2), Article 020505
Hauptverfasser:	Matsunaga, Ryusuke, Tsuji, Naoto, Makise, Kazumasa, Terai, Hirotaka, Aoki, Hideo, Shimano, Ryo
Format:	Artikel
Sprache:	eng
Schlagworte:	Approximation Charge density Dependence First principles Harmonic generations Incident light Mathematical analysis Mean field theory Niobium nitride Polarization Single crystals Spectroscopy Spectrum analysis Variation
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