The non-Drude type of optical conductivity in cuprates

Teng, Yunxue; Gao, He; Ma, Chunsheng; Yuan, Feng; Zhao, Huaisong

doi:10.1142/s0217984917502049

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…However, it is very hard to solve this strong electron-electron interaction problem in analytic approach. In order to deal with the local constraint, the Gutzwiller renormalization factors g t and g s are introduced to rewrite the t-J model as 31,[33][34][35] …”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…Within this self-consistent mean field theory, we have studied the doping and energy dependences of the quasiparticle scattering interference phenomenon, unusual electron spectrum and anomalous optical conductivity in cuprate superconductors. [33][34][35] In this paper, within this renormalized t-J model and self-consistent mean field theory, 33 we calculate the energy and doping dependence of thermal conductivity and explain the corresponding experimental data of thermal conductivity in cuprate superconductors.…”

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Doping and energy dependences of thermal conductivity in cuprate superconductors

Yuan

et al. 2017

Mod. Phys. Lett. B

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By considering the pseudogap effect, the doping and energy dependences of thermal conductivity in cuprate superconductors are studied. Our results show that the thermal conductivity as a function of energy exhibits a characteristic peak from underdoping to overdoping due to the presence of the pseudogap in pseudogap phase of cuprate superconductors. The thermal conductivity is strongly doping dependent. On the one hand, with increasing doping concentration, the weight of thermal conductivity increases quickly, especially the residual thermal conductivity which is in qualitative agreement with the experimental data. On the other hand, the characteristic energy corresponding to the position of the characteristic peak decreases monotonically upon increasing doping concentration, and it scales with the doping dependence of pseudogap. In particular, we have studied the doping dependence of the ratio of quasiparticle velocities normal and tangential to the Fermi surface at the nodes v F /v 2 . It is shown that v F /v 2 increases with the increase of doping concentration. Moreover, we explain that both the residual thermal conductivity and v F /v 2 increase rapidly upon the increase in doping concentration in heavily overdoped cuprate superconductors.

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Section: Theoretical Frameworkmentioning

confidence: 99%

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confidence: 99%

Doping and energy dependences of thermal conductivity in cuprate superconductors

Yuan

et al. 2017

Mod. Phys. Lett. B

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The anomalous electronic structure of electron-doped cuprate superconductors by considering the next higher harmonics of the superconducting gap

Qin

2021

Mod. Phys. Lett. B

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Based on the self-consistent mean field theory by considering the next higher harmonics of the superconducting (SC) gap, we discuss the energy and momentum dependence of the electron spectrum in electron-doped cuprate superconductors. By calculation of the electron spectral function, it is shown that the weight of the electron spectrum at the Fermi energy is strongly redistributed by the next higher harmonics of the SC gap in electron-doped cuprate superconductors, especially for the antinodal region. At the antinodal region, the weight of the electron spectrum at the Fermi surface increases with the increase of next higher harmonics term, reaches the maximum at a critical strength, then decreases when the next higher harmonics is larger. Our theoretical results show that the variation of the SC gap with the next higher harmonics can explain the anomalous behavior of the electron spectrum and different angle-resolved photoemission spectroscopy experimental results of different samples of electron-doped cuprate superconductors. Moreover, the magnitude of the SC gap can be suppressed by the next higher harmonics, which may be one of the reasons for the smaller SC gap in electron-doped cuprate superconductors. Obvious topological change happens in the SC gap at a critical strength of the next higher harmonics.

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The non-Drude type of optical conductivity in cuprates

Cited by 2 publications

References 24 publications

Doping and energy dependences of thermal conductivity in cuprate superconductors

Doping and energy dependences of thermal conductivity in cuprate superconductors

The anomalous electronic structure of electron-doped cuprate superconductors by considering the next higher harmonics of the superconducting gap

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