التفاصيل البيبلوغرافية
| العنوان: |
Exciton dynamics uncovering electron fractionalization in superconducting cuprates |
| المؤلفون: |
Singh, A., Huang, H. Y., Xie, J. D., Okamoto, J., Chen, C. T., Watanabe, T., Fujimori, A., Imada, M., Huang, D. J. |
| المصدر: |
Nature Communications volume 13, Article number: 7906 (2022) |
| سنة النشر: |
2022 |
| المجموعة: |
Condensed Matter |
| مصطلحات موضوعية: |
Condensed Matter - Strongly Correlated Electrons |
| الوصف: |
Electron quasiparticles play a crucial role in simplifying the description of many-body physics in solids with surprising success. Conventional Landau's Fermi-liquid and quasiparticle theories for high-temperature superconducting cuprates have, however, received skepticism from various angles. A path-breaking framework of electron fractionalization has been established to replace the Fermi-liquid theory for systems that show the fractional quantum Hall effect and the Mott insulating phenomena; whether it captures the essential physics of the pseudogap and superconducting phases of cuprates is still an open issue. Here, we show that excitonic excitation of optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ with energy far above the superconducting-gap energy scale, about 1 eV or even higher, is unusually enhanced by the onset of superconductivity. Our finding proves the involvement of such high-energy excitons in superconductivity. Therefore, the observed enhancement in the spectral weight of excitons imposes a crucial constraint on theories for the pseudogap and superconducting mechanisms. A simple two-component fermion model which embodies electron fractionalization in the pseudogap state well explains the change, pointing toward a novel route for understanding the electronic structure of superconducting cuprates. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.1038/s41467-022-35210-8 |
| URL الوصول: |
http://arxiv.org/abs/2207.12352 |
| رقم الانضمام: |
edsarx.2207.12352 |
| قاعدة البيانات: |
arXiv |