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Nonequilibrium Quasiparticle Dynamics in Bi-Based Superconductors Measured by Modulation Photoexcitation Spectroscopy

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Title: Nonequilibrium Quasiparticle Dynamics in Bi-Based Superconductors Measured by Modulation Photoexcitation Spectroscopy
Authors: Toda, Y. Browse this author →KAKEN DB
Mochizuki, H. Browse this author
Tsuchiya, S. Browse this author
Kurosawa, T. Browse this author
Oda, M. Browse this author
Mertelj, T. Browse this author
Mihailovic, D. Browse this author
Keywords: High-T-c cuprate superconductor
Time-resolved spectroscopy
Orbital angular momentum
Optical vortex
Issue Date: Mar-2018
Publisher: Springer
Journal Title: Journal of superconductivity and novel magnetism
Volume: 31
Issue: 3
Start Page: 753
End Page: 756
Publisher DOI: 10.1007/s10948-017-4325-9
Abstract: We develop an orbital angular momentum (OAM) excitation pump-probe (Pp) spectroscopy and perform experiments on a Bi2Sr2CaCu2O8+delta (Bi2212) superconductor. The OAM modulation for the pump is realized by using a transverse mode conversion technique which allows to modulate the chirality of the optical OAM with a fixed polarization. The result reveals a difference of the OAM-dependent transient reflectivity changes below T (c), indicating that the pump OAM can break the chiral symmetry of the superconducting (SC) state. The OAM dependences of the transient signal imply that the quasi-particle (QP) excitation with OAM enhances the SC with opposite chirality and/or suppress the SC with equal chirality. The temperature dependence of the OAM dynamics shows virtually no pairing fluctuation that usually appears in the QP dynamics observed by conventional Pp, suggesting that the nonequilibrium OAM dynamics is sensitive to the delocalized OAM associated with long range order.
Rights: The final publication is available at
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 戸田 泰則

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