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Proceedings Paper

Higgs amplitude mode in s-wave superconductors revealed by terahertz pump-terahertz probe spectroscopy
Author(s): Ryusuke Matsunaga; Ryo Shimano
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Paper Abstract

By using terahertz (THz) pump-THz probe spectroscopy, we investigated ultrafast dynamics of s-wave superconductors NbN. After instantaneous excitation with an intense monocycle THz pulse, transient oscillation of the superconducting order parameter is observed in the transmission of the THz probe pulse, which is interpreted as the collective Higgs amplitude mode associated with spontaneous symmetry breaking. We also found that the Higgs mode can be resonantly excited by a sub-gap multi-cycle THz pump pulse in the nonlinear response regime, resulting in efficient third-order harmonics generation. These results shed new light on the ultrafast optical control of quantum condensates and its application to THz nonlinear optics.

Paper Details

Date Published: 14 March 2015
PDF: 8 pages
Proc. SPIE 9361, Ultrafast Phenomena and Nanophotonics XIX, 93611C (14 March 2015); doi: 10.1117/12.2076142
Show Author Affiliations
Ryusuke Matsunaga, The Univ. of Tokyo (Japan)
Ryo Shimano, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 9361:
Ultrafast Phenomena and Nanophotonics XIX
Markus Betz; Abdulhakem Y. Elezzabi; Kong-Thon Tsen, Editor(s)

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