Anomalous Electron Spectrum and Its Relation to Peak Structure of Electron Scattering Rate in Cuprate Superconductors

Gao, Deheng; Mou, Yingping; Feng, Shiping

doi:10.1007/s10909-018-1870-y

Cited by 14 publications

(20 citation statements)

References 72 publications

(131 reference statements)

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“…5, where Γ ς (k, ω) exhibits a sharp peak-structure at both the antinodes near the X and Y points, with the position of the peak in Γ ς (k, ω) at the antinode near the X (Y) point corresponds exactly to the position of the dip in the PDH structure at the antinode near the X (Y) point shown in Fig. 4, indicating that the peak-structure in Γ ς (k, ω) is responsible directly for the PDH structure in the energy distribution curve [79][80][81] . However, the peak energy in Γ ς (k, ω) at the antinode near the X point is different from that at the antinode near the Y point, which leads to the inequivalence of the line-shape in the energy distribution curve between the antinodes near X and Y points.…”

Section: B Line-shape Anisotropy Of Energy Distribution Curvementioning

confidence: 52%

“…Theoretical, there is a general consensus that the emergence of the dip is a natural consequence of very strong scattering of the electrons mediated by bosonic excitations, although what type bosonic excitation that is the appropriate bosonic excitation for the role of the electron pairing glue is still under debate. In particular, both the experimental and theoretical studies indicate that the sharp peak in the quasiparticle scattering rate is directly responsible for the outstanding PDH structure in the energy distribution curve [79][80][81] .…”

Section: B Line-shape Anisotropy Of Energy Distribution Curvementioning

confidence: 99%

“…This inequivalence of the electronic structure between the k x and k y directions associated with the electronic nematicity can be also interpreted in terms of the quasiparticle scattering rate anisotropy. The origin of the emergence of the PDH structure in the energy distribution curve is intimately related to the corresponding peak-structure in the quasiparticle scattering rate generated from the electron interaction by the exchange of a strongly dispersive spin excitation [79][80][81] . From the singleparticle excitation spectrum in Eq.…”

Section: B Line-shape Anisotropy Of Energy Distribution Curvementioning

confidence: 99%

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Enhancement of superconductivity by electronic nematicity in cuprate superconductors

Cao,

Liu,

Guo

et al. 2021

Preprint

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The cuprate superconductors are characterized by numerous ordering tendencies, with the electronically nematic order being the most distinct form of order. Here the intertwinement of the electronic nematicity with superconductivity in cuprate superconductors is studied based on the kinetic-energy-driven superconductivity. It is shown that the optimized Tc takes a dome-like shape with the weak and strong strength regions on each side of the optimal strength of the electronic nematicity, where the optimized Tc reaches its maximum. This dome-like shape nematic-order strength dependence of Tc thus indicates that the electronic nematicity enhances superconductivity. Moreover, this nematic order induces the anisotropy of the electron Fermi surface, where although the original electron Fermi surface contour with the four-fold rotation symmetry is broken up into that with a residual two-fold rotation symmetry, this electron Fermi surface contour with the two-fold rotation symmetry still is truncated to form the disconnected Fermi arcs with the most spectral weight that locates at around the tips of the Fermi arcs. Concomitantly, these tips of the Fermi arcs connected by the scattering wave vectors q i construct an octet scattering model, however, the partial scattering wave vectors and their respective symmetry-corresponding partners occur with unequal amplitudes, leading to these electronically ordered states being broken both rotation and translation symmetries. As a natural consequence, the electronic structure is inequivalent between the kx and ky directions in momentum space. These anisotropic features of the electronic structure are also confirmed via the result of the autocorrelation of the single-particle excitation spectra, where the breaking of the rotation symmetry is verified by the inequivalence on the average of the electronic structure at the two Bragg scattering sites. Furthermore, the strong energy dependence of the order parameter of the electronic nematicity is also discussed.

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Section: B Line-shape Anisotropy Of Energy Distribution Curvementioning

confidence: 52%

Section: B Line-shape Anisotropy Of Energy Distribution Curvementioning

confidence: 99%

Section: B Line-shape Anisotropy Of Energy Distribution Curvementioning

confidence: 99%

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Enhancement of superconductivity by electronic nematicity in cuprate superconductors

Cao,

Liu,

Guo

et al. 2021

Preprint

Self Cite

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“…The extended s-wave superconducting gap composed of ∆ dd (k, ε) and ∆ αβ (k, ε), which emerges due to the pair-hopping interaction via the SK mechanism, corresponds to the kinetic-energy-driven superconductivity of the single-band t-J model [72][73][74][75][76][77][78][79][80]. In the kinetic-energy-driven superconductivity, the charge carriers form the superconducting pairs to gain kinetic energy.…”

Section: Resultsmentioning

confidence: 99%

Coexistence of $s$- and $d$-wave gaps due to pair-hopping and exchange interactions

Koikegami

2021

Preprint

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I investigate the superconductivity of the three-band t-J-U model derived from the three-band Hubbard model using the Schrieffer-Wolff transformation. My model is designed considering the hole-doped high-T c superconducting cuprate. The model does not exclude the double occupancy of Cu sites by d electrons, and there is a pair-hopping interaction between the d and p bands together with the exchange interaction. I analyse the superconducting transition temperature, electronic state, and superconducting gap function based on strong coupling theory and find that the superconductivity emerges due to the pair-hopping and exchange interactions via the Suhl-Kondo mechanism. In the superconducting state, the extended s-and d x 2 −y 2wave superconducting gaps coexist, where both charge fluctuations and d-p band hybridization are key ingredients.

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“…The effect of the renormalization of the electrons in cuprate superconductors detected from ARPES experiments is quantitatively characterized by the experimentally measurable quantities [5][6][7][8][9][10][43][44][45][46][47] such as the EFS reconstruction, the complicated line-shape in the electron quasiparticle excitation spectrum, the kinks in the electron quasiparticle dispersion, and the ARPES autocorrelation. Recently, we [48][49][50][51][52][53] have studied the renormalization of the electrons in the single-layer cuprate superconductors based on the framework of the kinetic-energy driven SC mechanism, and reproduced the main features observed from the corresponding ARPES experiments, including the renormalization from the quasiparticle scattering reduces the spectral weight in EFS to the tips of the Fermi arcs [50][51][52] , the charge-order correlation driven by the EFS instability with the characteristic chargeorder wave vector corresponding to the straight hot spots on EFS [49][50][51] , the striking PDH structure in the electron quasiparticle excitation spectrum [50][51][52] , and the remarkable ARPES autocorrelation and its connection with the quasiparticle scattering interference (QSI) 53 . However, the significant coupling effect between the copper-oxide layers on the renormalization of the electrons has not been clarified in these discussions due to the limitation in the single-layer case.…”

Section: Introductionmentioning

confidence: 99%

Renormalization of electrons in bilayer cuprate superconductors

Liu,

Lan,

Mou

et al. 2020

Preprint

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Cuprate superconductors have a layered structure, and then the physical properties are significantly enriched when two or more two copper-oxide layers are contained in a unit cell. Here the characteristic features of the renormalization of the electrons in the bilayer cuprate superconductors are investigated within the framework of the kinetic-energy driven superconducting mechanism. It is shown that the electron quasiparticle excitation spectrum is split into its bonding and antibonding components due to the presence of the bilayer coupling, with each component that is independent. However, in the underdoped and optimally doped regimes, although the bonding and antibonding electron Fermi surface contours deriving from the bonding and antibonding layers are truncated to form the disconnected bonding and antibonding Fermi arcs, almost all spectral weights in the bonding and antibonding Fermi arcs are reduced to the tips of the bonding and antibonding Fermi arcs, which in this case coincide with the bonding and antibonding hot spots. These hot spots connected by the scattering wave vectors q i construct an octet scattering model, and then the enhancement of the quasiparticle scattering processes with the scattering wave vectors qi is confirmed via the result of the autocorrelation of the electron quasiparticle excitation spectral intensities. Moreover, the peak-dip-hump structure developed in each component of the electron quasiparticle excitation spectrum along the corresponding electron Fermi surface is directly related with the peak structure in the quasiparticle scattering rate except for at around the hot spots, where the peak-dip-hump structure is caused mainly by the pure bilayer coupling. Although the kink in the electron quasiparticle dispersion is present all around the electron Fermi surface, when the momentum moves away from the node to the antinode, the kink energy smoothly decreases, while the dispersion kink becomes more pronounced, and in particular, near the cut close to the antinode, develops into a break separating of the fasting dispersing high-energy part of the electron quasiparticle excitation spectrum from the slower dispersing low-energy part. By comparing with the corresponding results in the single-layer case, the theory also indicates that the characteristic features of the renormalization of the electrons are particularly obvious due to the presence of the bilayer coupling.

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Anomalous Electron Spectrum and Its Relation to Peak Structure of Electron Scattering Rate in Cuprate Superconductors

Cited by 14 publications

References 72 publications

Enhancement of superconductivity by electronic nematicity in cuprate superconductors

Enhancement of superconductivity by electronic nematicity in cuprate superconductors

Coexistence of $s$- and $d$-wave gaps due to pair-hopping and exchange interactions

Renormalization of electrons in bilayer cuprate superconductors

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