A1 Journal article (refereed)
Nonlinear electromagnetic response and Higgs-mode excitation in BCS superconductors with impurities (2019)

Silaev, M. (2019). Nonlinear electromagnetic response and Higgs-mode excitation in BCS superconductors with impurities. Physical Review B, 99(22), Article 224511. https://doi.org/10.1103/PhysRevB.99.224511

JYU authors or editors

Publication details

All authors or editors: Silaev, Mikhail

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2019

Volume: 99

Issue number: 22

Article number: 224511

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.99.224511

Publication open access: Not open

Publication channel open access: 

Publication is parallel published: https://arxiv.org/abs/1902.01666

Abstract

We reveal that due to the presence of disorder oscillations of the order parameter amplitude called the Higgs mode can be effectively excited by the external electromagnetic radiation in usual BCS superconductors. This mechanism works for superconductors with both isotropic s-wave and anisotropic, such as d-wave, pairings. The nonlinear response in the presence of impurities is captured by the quasiclassical formalism. We demonstrate that analytical solutions of the Eilenberger equation with impurity collision integral and external field drive coincide with the exact summation of ladder impurity diagrams. Using the developed formalism we show that resonant third-harmonic signal observed in recent experiments is naturally explained by the excitation of Higgs mode mediated by impurity scattering.

Keywords: superconductors; impurities; electromagnetic fields

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2