Anisotropic electron damping and energy gap in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$
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| Format: | Preprint |
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2025
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| author | Li, Jiemin Gu, Yanhong Yamada, Takemi Wu, Zebin Gu, Genda Valla, Tonica Drozdov, Ilya Bozovic, Ivan Dean, Mark P. M. Tohyama, Takami Pelliciari, Jonathan Bisogni, Valentina |
| author_facet | Li, Jiemin Gu, Yanhong Yamada, Takemi Wu, Zebin Gu, Genda Valla, Tonica Drozdov, Ilya Bozovic, Ivan Dean, Mark P. M. Tohyama, Takami Pelliciari, Jonathan Bisogni, Valentina |
| contents | The many body electron-electron interaction in cuprates causes the broadening of the electronic bands in \textit{\textbf{k}}-space, leading to a deviation from the standard Fermi liquid. While a \textit{\textbf{k}}-dependent anisotropic electronic scattering (\textit{\textbf{k}}-DAES) has been assessed by photoemission, its fingerprint in \textit{\textbf{Q}}-space has been scarcely considered. Here, we explore the \textit{\textbf{Q}}-dependent electron dynamics in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ through the evolution of low-energy charge excitations as measured by resonant inelastic x ray scattering (RIXS). In the normal state, the RIXS spectra display a continuum of excitations down to 0~meV, while the superconducting state features a spectral weight suppression below 80 meV without any enhancement at higher energies. To interpret the energy and \textit{\textbf{Q}}-evolution of our data, we introduce a phenomenological expression of the charge susceptibility by including the \textit{\textbf{k}}-DAES. We show that only the charge susceptibility with \textit{\textbf{k}}-DAES captures the RIXS data, highlighting the importance of \textit{\textbf{k}}-DAES when describing the \textit{\textbf{Q}}-dependence of charge excitations from 0 to few eV scale. Furthermore, we also find that the inclusion of \textit{\textbf{k}}-DAES is essential when quantitative parameters such as the electronic energy gap are extracted from RIXS data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_21687 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anisotropic electron damping and energy gap in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Li, Jiemin Gu, Yanhong Yamada, Takemi Wu, Zebin Gu, Genda Valla, Tonica Drozdov, Ilya Bozovic, Ivan Dean, Mark P. M. Tohyama, Takami Pelliciari, Jonathan Bisogni, Valentina Strongly Correlated Electrons The many body electron-electron interaction in cuprates causes the broadening of the electronic bands in \textit{\textbf{k}}-space, leading to a deviation from the standard Fermi liquid. While a \textit{\textbf{k}}-dependent anisotropic electronic scattering (\textit{\textbf{k}}-DAES) has been assessed by photoemission, its fingerprint in \textit{\textbf{Q}}-space has been scarcely considered. Here, we explore the \textit{\textbf{Q}}-dependent electron dynamics in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ through the evolution of low-energy charge excitations as measured by resonant inelastic x ray scattering (RIXS). In the normal state, the RIXS spectra display a continuum of excitations down to 0~meV, while the superconducting state features a spectral weight suppression below 80 meV without any enhancement at higher energies. To interpret the energy and \textit{\textbf{Q}}-evolution of our data, we introduce a phenomenological expression of the charge susceptibility by including the \textit{\textbf{k}}-DAES. We show that only the charge susceptibility with \textit{\textbf{k}}-DAES captures the RIXS data, highlighting the importance of \textit{\textbf{k}}-DAES when describing the \textit{\textbf{Q}}-dependence of charge excitations from 0 to few eV scale. Furthermore, we also find that the inclusion of \textit{\textbf{k}}-DAES is essential when quantitative parameters such as the electronic energy gap are extracted from RIXS data. |
| title | Anisotropic electron damping and energy gap in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.21687 |