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High-order nonlinear terahertz probing of the two-band superconductor MgB$_2$: Third- and fifth-order harmonic generation

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arxiv 2207.12361 v2 pith:5K2TYENV submitted 2022-07-25 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

C. Reinhoffer , P. Pilch , A. Reinold , P. Derendorf , S. Kovalev , J.-C. Deinert , I. Ilyakov , A. Ponomaryov
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Min Chen Tie-Quan Xu Yue Wang Zi-Zhao Gan De-Sheng Wu Jian-Lin Luo S. Germanskiy E. A. Mashkovich P. H. M. van Loosdrecht I. M. Eremin Zhe Wang
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classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords superconductinghigh-ordernonlinearphaseterahertzfieldfifth-ordergeneration
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abstract

We report on high-order harmonic generation in the two-band superconductor MgB$_2$ driven by intense terahertz electromagnetic pulses. Third- and fifth-order harmonics are resolved in time domain and investigated as a function of temperature and in applied magnetic fields crossing the superconducting phase boundary. The high-order harmonics in the superconducting phase reflects nonequilibrium dynamics of the superconducting order parameter in MgB$_2$, which is probed via nonlinear coupling to the terahertz field. The observed temperature and field dependence of the nonlinear response allows to establish the superconducting phase diagram.

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