Infrared Activation of the Higgs Mode by Supercurrent Injection in Superconducting NbN

Sachiko Nakamura, Yudai Iida, Yuta Murotani, Ryusuke Matsunaga, Hirotaka Terai, Ryo Shimano

研究成果: ジャーナルへの寄稿学術誌査読

51 被引用数 (Scopus)

抄録

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 ω=2Δ 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.

本文言語英語
論文番号257001
ジャーナルPhysical review letters
122
25
DOI
出版ステータス出版済み - 6月 25 2019
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学一般

フィンガープリント

「Infrared Activation of the Higgs Mode by Supercurrent Injection in Superconducting NbN」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル