Band-selective third-harmonic generation in superconducting MgB2 : Possible evidence for the Higgs amplitude mode in the dirty limit

Sergey Kovalev, Tao Dong, 3, ∗ Li-Yu Shi, Chris Reinhoffer, Tie-Quan Xu, Hong-Zhang Wang, Yue Wang, Zi-Zhao Gan, Semyon Germanskiy, Jan-Christoph Deinert, Igor Ilyakov, Paul H. M. van Loosdrecht, Dong Wu, Nan-Lin Wang, 6 Jure Demsar, and Zhe Wang 4, 1, † Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany Institute of Physics, Johannes Gutenberg-University Mainz, 55128 Mainz, Germany International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China Institute of Physics II, University of Cologne, 50937 Cologne, Germany Applied Superconductivity Center and State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China Beijing Academy of Quantum Information Sciences, Beijing 100913, China Department of Physics, TU Dortmund University, 44227 Dortmund, Germany (Dated: October 26, 2021)