Selective hybridization between the main band and the superstructure band in the 
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 superconductor

Gao, Qiang; Yan, Hongtao; Liu, Jing; Ai, Ping; Cai, Yongqing; Liu, Cong; Luo, Xiangyu; Cheng, Honghui; Song, Chunyao; Huang, Jianwei; Rong, Hongtao; Huang, Yuan; Wang, Qingyan; Liu, Guodong; Gu, Genda; Zhang, Fengfeng; Yang, Feng; Zhang, Shenjin; Peng, Qinjun; Xu, Zuyan; Zhao, Lin; Xiang, Tao; Zhou, Xianju

doi:10.1103/physrevb.101.014513

Cited by 8 publications

(14 citation statements)

References 66 publications

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“…2a as #1. These k-points have been chosen to avoid the regions of hybridization between the main and replica bands, where the dispersions are distorted 15 , and keep the gap large enough in comparison with our experimental resolution. Figure 3b represents this band structure symmetrized relative to Fermi level (E F ) as I PE (E, k) = I PE (−E, k).…”

Section: Matrix Element Effectsmentioning

confidence: 99%

The relevance of ARPES to high-Tc superconductivity in cuprates

Matt

Bisti

et al. 2020

npj Quantum Mater.

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Angle-resolved photoemission spectroscopy, visualizing the superconducting gap in k-space, plays a pivotal role in research on cuprates and other high-T c superconducting materials. However, there has always been an imminent doubt whether this technique truly represents the intrinsic bulk spectral function, whose response can be distorted by energy-and k-dependence of the photoexcitation matrix element, and by a small photoelectron escape depth of few surface atomic layers. Here, we address this fundamental question with soft-X-ray photoemission measurements of the superconducting gap in the paradigm high-T c cuprate Bi 2 Sr 2 CaCu 2 O 8. We vary the matrix element by spanning a dense k-space grid, formed by the lattice superstructure, and the probing depth by changing the emission angle. The measured gap appears independent of the matrix element effects, probing depth or photoexcitation energy. This fact proves the relevance of photoemission studies for the bulk superconductivity in Bi 2 Sr 2 CaCu 2 O 8 , and calls for similar verification experiments on other high-T c compounds, in particular more three-dimensional ones. Bi 2 Sr 2 CaCu 2 O 8 shows an anomalously fast decay of the coherent spectral weight with photon energy, tracing back to strong electron-phonon interaction or relaxation of the lattice coherence.

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Section: Matrix Element Effectsmentioning

confidence: 99%

The relevance of ARPES to high-Tc superconductivity in cuprates

Matt

Bisti

et al. 2020

npj Quantum Mater.

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“…F0 in the bilayer case deriving directly from the bonding and antibonding layers. These bonding and antibonding EFS contours correspond to different charge-carrier doping levels [35][36][37][38][39][40][41] . The result in Fig.…”

Section: A Electron Fermi Surface Instabilitymentioning

confidence: 99%

“…BS ) is bifurcated from the bonding (antibonding) EFS contour k BS are suppressed, leading to that these two sheets become unobservable in experiments [39][40][41] ; (c) on the other hand, the lifetime renormalization of the electrons on the bonding (antibonding) EFS contour k…”

Section: A Electron Fermi Surface Instabilitymentioning

confidence: 99%

“…F , 0)] therefore suppresses heavily the spectral weight of the electron quasiparticle excitation spectrum on the bonding (antibonding) EFS contour at around the bonding (antibonding) antinodes [39][40][41]46,82,83 . However, it suppresses modestly the spectral weight on the bonding (antibonding) EFS contour at around the nodes 98 , and has the weakest scattering at around the bonding (antibonding) hot spots.…”

Section: B Octet Scattering Model and Related Coexistence And Competi...mentioning

confidence: 99%

“…In particular, the bilayer cuprate superconductor is an ideal system to tackle the coupling effect between the copper-oxide layers on the renormalization of the electrons, where the bilayer splitting due to the presence of the bilayer interaction in a unit cell has been observed from the angle-resolved photoemission spectroscopy (ARPES) experiments in a wide doping range [32][33][34] , with the largest value of the bilayer splitting that appears at around the antinodal region, and then decreases upon approaching to the nodal region. In particular, these ARPES experimental observations also indicate that this bilayer splitting derives the electron quasiparticle excitation spectrum into the bonding and antibonding components [32][33][34] , which leads to form the bonding and antibonding electron Fermi surface (EFS) contours corresponding to different doping levels with distinct SC gap [35][36][37][38][39][40][41] . Moreover, it has been shown that this bilayer coupling may play a main role in the form of the well-known peak-dip-hump (PDH) structure in the electron quasiparticle excitation spectrum of the bilayer cuprate superconductors in the overdoped regime [42][43][44] .…”

Section: Introductionmentioning

confidence: 99%

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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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