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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.14238 |
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| _version_ | 1866913126720471040 |
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| author | Taniguchi, Yuto Kato, Ryo Amano, Tatsuya Itoh, Hirotake Kawakam, Yohei Nakamura, Yuto Kishida, Hideo Bernhard, Christian Demsar, Jure Sasaki, Takahiko Nishizaki, Terukazu Yonemitsu, Kenji Iwai, Shinichiro |
| author_facet | Taniguchi, Yuto Kato, Ryo Amano, Tatsuya Itoh, Hirotake Kawakam, Yohei Nakamura, Yuto Kishida, Hideo Bernhard, Christian Demsar, Jure Sasaki, Takahiko Nishizaki, Terukazu Yonemitsu, Kenji Iwai, Shinichiro |
| contents | Understanding how quasiparticles are generated following a rapid quench of superconductivity in high-Tc cuprates is a key unresolved problem in nonequilibrium superconductivity. Here we resolve these processes in optimally doped YBCO [YBa2Cu3Oy(y=6.94, Tc=92 K)] using broadband (0.16 -4.1 eV, ca. 100 fs) and nearly single-cycle (6 fs) transient reflectivity spectroscopy. We show that within a few femtosecond, enhanced electron-electron Umklapp scattering dominates, signaling a transient modulation of long-range Coulomb interactions on the eV scale. This regime is followed by a rapid suppression of the scattering rate of the mid-infrared absorption associated with carriers dressed by spin fluctuations. We attribute this observation to an ultrafast decoupling of quasiparticles from the spin-fluctuation background, occurring on a 90 fs timescale set by the inverse optical gap. These findings reveal the correlated many-body dynamics underlying quasiparticle generation in cuprates and provide further clues for unconventional pairing mechanism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14238 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrafast decoupling of quasiparticles and spin fluctuations in superconducting cuprates Taniguchi, Yuto Kato, Ryo Amano, Tatsuya Itoh, Hirotake Kawakam, Yohei Nakamura, Yuto Kishida, Hideo Bernhard, Christian Demsar, Jure Sasaki, Takahiko Nishizaki, Terukazu Yonemitsu, Kenji Iwai, Shinichiro Strongly Correlated Electrons Understanding how quasiparticles are generated following a rapid quench of superconductivity in high-Tc cuprates is a key unresolved problem in nonequilibrium superconductivity. Here we resolve these processes in optimally doped YBCO [YBa2Cu3Oy(y=6.94, Tc=92 K)] using broadband (0.16 -4.1 eV, ca. 100 fs) and nearly single-cycle (6 fs) transient reflectivity spectroscopy. We show that within a few femtosecond, enhanced electron-electron Umklapp scattering dominates, signaling a transient modulation of long-range Coulomb interactions on the eV scale. This regime is followed by a rapid suppression of the scattering rate of the mid-infrared absorption associated with carriers dressed by spin fluctuations. We attribute this observation to an ultrafast decoupling of quasiparticles from the spin-fluctuation background, occurring on a 90 fs timescale set by the inverse optical gap. These findings reveal the correlated many-body dynamics underlying quasiparticle generation in cuprates and provide further clues for unconventional pairing mechanism. |
| title | Ultrafast decoupling of quasiparticles and spin fluctuations in superconducting cuprates |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.14238 |