Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea.
Sci Rep. 2023 Feb 13;13(1):2527. doi: 10.1038/s41598-023-29829-w.
We investigated the temperature- and frequency-dependent optical scattering rates in the pseudogap phase of cuprates using model pseudogap and electron-boson spectral density (EBSD) functions. We obtained the scattering rates at various temperatures below and above a given pseudogap temperature using a generalized Allen's (or Sharapov's) formula, which has been used to analyse the measured optical spectra of correlated electron systems with a non-constant density of states at finite temperatures. The pseudogap and EBSD functions should be temperature dependent to simulate the Fermi liquid-like behaviour of underdoped cuprate systems observed in optical studies. Therefore, the observed Fermi liquid-like behaviour can be understood by considering the combined contribution from the T-dependent EBSD function and the T-dependent pseudogap. We also obtained the optical conductivity spectra from the optical scattering rates and analyzed them to investigate intriguing electronic properties. We expect that our results will aid in understanding the Fermi liquid-like optical response in the pseudogap phase and in revealing the microscopic pairing mechanism for superconductivity in cuprates.
我们使用赝能隙和电子-声子谱密度（EBSD）函数研究了铜氧化物中赝能隙相的温度和频率相关的光学散射率。我们使用广义的 Allen（或 Sharapov）公式，在给定的赝能隙温度以下和以上的各种温度下获得散射率，该公式已被用于分析在有限温度下具有非恒定态密度的相关电子系统的测量光学光谱。赝能隙和 EBSD 函数应该是温度相关的，以模拟光学研究中观察到的欠掺杂铜氧化物系统的类费米液体行为。因此，通过考虑 T 相关的 EBSD 函数和 T 相关的赝能隙的组合贡献，可以理解观察到的类费米液体行为。我们还从光学散射率获得了光学电导率谱，并对其进行了分析，以研究有趣的电子特性。我们期望我们的结果将有助于理解赝能隙相中类费米液体的光学响应，并揭示铜氧化物中超导的微观配对机制。
