3 papers
cond-mat.supr-con2020
Nonreciprocal Terahertz Second Harmonic Generation in Superconducting NbN under Supercurrent Injection
Sachiko Nakamura, Kota Katsumi, Hirotaka Terai +1
Giant second-harmonic generation (SHG) in the terahertz (THz) frequency range is observed in a thin film of an s-wave superconductor NbN, where the time-reversal (-) a…
cond-mat.supr-con2019
Superconducting fluctuations probed by the Higgs mode in BiSrCaCuO thin films
Kota Katsumi, Zhi Zhong Li, Hélène Raffy +2
Superconducting (SC) fluctuations in cuprate superconductors have been extensively studied to gain a deep insight into preformed Cooper pairs above the SC transition temperature $T…
cond-mat.supr-con2019
Phase-resolved Higgs response in superconducting cuprates
Hao Chu, Min-Jae Kim, Kota Katsumi +26
In high energy physics, the Higgs field couples to gauge bosons and fermions and gives mass to their elementary excitations. Experimentally, such couplings can be inferred from the…