Polarization dependence of the third-harmonic generation in multiband superconductors
Autor: | Cea, T., Barone, P., Castellani, C., Benfatto, L. |
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Rok vydání: | 2017 |
Předmět: | |
Zdroj: | Phys. Rev. B 97, 094516 (2018) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevB.97.094516 |
Popis: | In a superconductor the third-harmonic generation (THG) of a strong THz pulse is enhanced below Tc by the resonant excitation of lattice-modulated charge fluctuations (LCF), which modulate the response according to the polarization of the field. Here we compute the THG within a multiband model for the prototype NbN superconductor. We show that the non-resonant contribution coming from the instantaneous electronic response and the finite width of the pulse significantly suppress the polarization dependence of the signal, challenging its observation in real systems. Comment: Final version, as published |
Databáze: | arXiv |
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