Kovalev, Sergey ORCID: 0000-0002-2290-1016, Dong, Tao, Shi, Li-Yu, Reinhoffer, Chris, Xu, Tie-Quan, Wang, Hong-Zhang, Wang, Yue, Gan, Zi-Zhao, Germanskiy, Semyon, Deinert, Jan-Christoph, Ilyakov, Igor, van Loosdrecht, Paul H. M., Wu, Dong, Wang, Nan-Lin, Demsar, Jure and Wang, Zhe ORCID: 0000-0001-7464-5408 (2021). Band-selective third-harmonic generation in superconducting MgB2: Possible evidence for the Higgs amplitude mode in the dirty limit. Phys. Rev. B, 104 (14). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report on time-resolved linear and nonlinear terahertz spectroscopy of the two-band superconductor MgB2 with a superconducting transition temperature T-c approximate to 36 K. Third-harmonic generation (THG) is observed below T-c by driving the system with intense narrow-band THz pulses. For the pump-pulse frequencies f = 0.3, 0.4, and 0.5 THz, the temperature-dependent evolution of the THG signals exhibits a resonance maximum at the temperatures with the resonance conditions 2 f = 2 Delta(pi) (T) fulfilled, for the dirty-limit superconducting gap 2 Delta(pi). In contrast, for f = 0.6 and 0.7 THz with 2 f > 2 Delta(pi) (T -> 0) = 1.03 THz, the THG intensity increases monotonically with decreasing temperature. Moreover, for 2f < 2 Delta(pi) (T -> 0) the THG is found nearly isotropic with respect to the pump-pulse polarization. These results suggest a predominant contribution of the driven Higgs amplitude mode of the dirty-limit pi-band superconducting gap, pointing to the importance of scattering for observation of the Higgs mode in superconductors.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Kovalev, SergeyUNSPECIFIEDorcid.org/0000-0002-2290-1016UNSPECIFIED
Dong, TaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shi, Li-YuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reinhoffer, ChrisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Xu, Tie-QuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, Hong-ZhangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, YueUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gan, Zi-ZhaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Germanskiy, SemyonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deinert, Jan-ChristophUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ilyakov, IgorUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Loosdrecht, Paul H. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wu, DongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, Nan-LinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Demsar, JureUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, ZheUNSPECIFIEDorcid.org/0000-0001-7464-5408UNSPECIFIED
URN: urn:nbn:de:hbz:38-593920
DOI: 10.1103/PhysRevB.104.L140505
Journal or Publication Title: Phys. Rev. B
Volume: 104
Number: 14
Date: 2021
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/59392

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