期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.257001
关键词
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资金
- JSPS KAKENHI [15H02102, 15H05452, 18K13496]
- Photon Frontier Network Program from MEXT, Japan
- JSPS
- Grants-in-Aid for Scientific Research [15H02102, 15H05452, 18K13496] Funding Source: KAKEN
The Higgs mode in superconductors, i.e., the collective amplitude mode of the order parameter, does not associate with charge nor spin fluctuations, therefore it does not couple to the electromagnetic field in the linear response regime. Contrary to this common understanding, here, we demonstrate that if the dc supercurrent is introduced into the superconductor, the Higgs mode becomes infrared active and is directly observed in the linear optical conductivity measurement. We observed a sharp resonant peak at omega = 2 Delta in the optical conductivity spectrum of a thin-film NbN in the presence of dc supercurrent, showing a reasonable agreement with the recent theoretical prediction. The method as proven by this work opens a new pathway to study the Higgs mode in a wide variety of superconductors.
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