Giant second harmonic transport under time-reversal symmetry in a trigonal superconductor

Nonreciprocal or even-order nonlinear responses in symmetry-broken systems are powerful probes of emergent properties in quantum materials, including superconductors, magnets, and topological materials. Recently, vortex matter has been recognized as a key ingredient of giant nonlinear responses in s...

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Bibliographic Details
Published in:Nature communications 2022-03, Vol.13 (1), p.1659-1659, Article 1659
Main Authors: Itahashi, Yuki M., Ideue, Toshiya, Hoshino, Shintaro, Goto, Chihiro, Namiki, Hiromasa, Sasagawa, Takao, Iwasa, Yoshihiro
Format: Article
Language:English
Subjects:
639/301/119/1003
639/301/119/995
Hall effect
Humanities and Social Sciences
Magnetic properties
Magnets
multidisciplinary
Nonlinear phenomena
Nonlinear response
Nonlinear systems
Nonlinearity
Quantum transport
Science
Science (multidisciplinary)
Superconductors
Symmetry
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Summary:Nonreciprocal or even-order nonlinear responses in symmetry-broken systems are powerful probes of emergent properties in quantum materials, including superconductors, magnets, and topological materials. Recently, vortex matter has been recognized as a key ingredient of giant nonlinear responses in superconductors with broken inversion symmetry. However, nonlinear effects have been probed as excess voltage only under broken time-reversal symmetry. In this study, we report second harmonic transport under time-reversal symmetry in the noncentrosymmetric trigonal superconductor PbTaSe 2 . The magnitude of anomalous nonlinear transport is two orders of magnitude larger than those in the normal state, and the directional dependence of nonlinear signals are fully consistent with crystal symmetry. The enhanced nonlinearity is semiquantitatively explained by the asymmetric Hall effect of vortex-antivortex string pairs in noncentrosymmetric systems. This study enriches the literature on nonlinear phenomena by elucidating quantum transport in noncentrosymmetric superconductors. Even-order nonlinear transport is a powerful probe of quantum materials, but such studies in superconductors have been limited to those which break time-reversal symmetry. Here, the authors observe second-order nonlinear transport in time-reversal-symmetric PbTaSe 2 , where the nonlinearity is enhanced in the superconducting state.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-29314-4