High-Energy Scale Revival and Giant Kink in the Dispersion of a Cuprate Superconductor

Xie, B. P.; Yang, Kaiyu; Shen, Dawei; Zhao, Jun; Ou, H. W.; Jia, Wei; Gu, S.Y.; Arita, Masashi; Qiao, Shuang; Namatame, H.; Takeuchi, Masaki; Kaneko, Nobu‐Hisa; Eisaki, H.; Tsuei, Ku Ding; Cheng, Chih Ming; Vobornik, I.; Fujii, Jun; Rossi, G.; Yang, Zongxian; Feng, D. L.

doi:10.1103/physrevlett.98.147001

Cited by 101 publications

(77 citation statements)

References 29 publications

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“…They are in a good correspondence to experimental ARPES data. Indeed, in a wide area of frequencies a weak momentum dependence of spectrum along the nodal direction was found that is in agreement with experiment [11]. The spectral density turned out to be typical for strongly coherent excitations near the Fermi level in case of the strong electron-phonon binding.…”

Section: Discussionsupporting

confidence: 87%

“…It is a result of the appearance of polaron bands which are grouped near the frequencies to be multiple the phonon frequency ω 0 . It should be noted that there is a weak dependence of resonance frequency on k at g=0.06 (see Fig.17 a, curve 4) that is in agreement with ARPES experimental data [11]. The fine spectrum structure near the Fermi level shows an enough drastic frequency change with a small change of k. In particular, below the Fermi level the first kink is observed at Ω k ∼ −ω 0 , i.e.…”

Section: Influence Of the Electron-phonon Interaction On Electron supporting

confidence: 85%

“…In some cases authors use the methods of metal physics especially to build the HTSC model and to account for strong electron-phonon interactions that is not useful for electron systems with strong correlations [6][7][8]. One of the puzzle phenomenon which is not described by existing theories is low-energy kink experimentally observed in the nodal dispersion of various cuprate materials [9][10][11]. Below we will give a theory which explains the origin of pointed anomaly and presents the consecutive picture of the strongly correlated electron dynamics in cuprates.…”

Section: Introductionmentioning

confidence: 99%

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Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data

Zubov

2016

Low Temperature Physics

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An influence of the electron-phonon interaction on excitation spectrum and damping in a narrow band electron subsystem of cuprates has been investigated. Within the framework of the t-J model an approach to solving a problem of account of both strong electron correlations and local electronphonon binding with characteristic Einstein mode ω0 in the normal state has been presented. In approximation Hubbard-I it was found an exact solution to the polaron bands. We established that in the low-dimensional system with a pure kinematic part of Hamiltonian a complicated excitation spectrum is realized. It is determined mainly by peculiarities of the lattice Green's function. In the definite area of the electron concentration and hopping integrals a correlation gap may be possible on the Fermi level. Also, in specific cases it is observed a doping evolution of the Fermi surface. We found that the strong electron-phonon binding enforces a degree of coherence of electron-polaron excitations near the Fermi level and spectrum along the nodal direction depends on wave vector module weakly. It corresponds to ARPES data. A possible origin of the experimentally observed kink in the nodal direction of cuprates is explained by fine structure of the polaron band to be formed near the mode -ω0.

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Section: Discussionsupporting

confidence: 87%

Section: Influence Of the Electron-phonon Interaction On Electron supporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data

Zubov

2016

Low Temperature Physics

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“…It is well known that t ′ qualitatively changes the quasiparticle dispersion and mimics the differences between hole-and electron-doping in cuprates found using Hamiltonians which incorporate higher energy degrees of freedom 11,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] , cf. Fig.…”

Section: The 2d Hubbard Model Hamiltonian H H Ismentioning

confidence: 99%

Origin of strong dispersion in Hubbard insulators

et al. 2015

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Using cluster perturbation theory, we explain the origin of the strongly dispersive feature found at high binding energy in the spectral function of the Hubbard model. By comparing the Hubbard and t−J−3s model spectra, we show that this dispersion does not originate from either coupling to spin fluctuations (∝ J) or the free hopping (∝ t). Instead, it should be attributed to a long-range, correlated hopping ∝ t 2 /U , which allows an effectively free motion of the hole within the same antiferromagnetic sublattice. This origin explains both the formation of the high energy anomaly in the single-particle spectrum and the sensitivity of the high binding energy dispersion to the next-nearest-neighbor hopping t ′ .PACS numbers: 71.10. Fd, 74.72.Cj, I. INTORDUCTIONHigh-temperature superconductivity in the cuprate oxides has attracted significant attention over the past thirty years. However, the precise origin of this phenomenon is not well understood due to the complex physics even in a minimal model used to describe the correlated nature of the electrons [1][2][3] : the 2D Hubbard model. It is often assumed that a first step in understanding the physics of this model is to study its spectral properties 4-17 in the simple undoped limit. The spectral function of the undoped 2D Hubbard model when the free electron bandwidth W is comparable to the Hubbard interaction U consists of two prominent features in the band structure, cf. Fig. 1. At low binding energies (LBE), a sharply defined quasiparticle-like excitation disperses downward from (π/2, π/2) reaching an energy of the order of spin exchange J = 4t 2 /U near the Γ-point (0,0). This quasiparticle, often labeled the spin polaron (SP) 18 , represents a hole heavily dressed by spin excitations from the antiferromagnetic (AF) ground state with its bandwidth no longer governed by the free electron hopping t but by the spin exchange J 9,18-23 . At higher binding energies (HBE), another feature becomes prominent approaching the Γ-point. The delineation of the LBE spin polaron from the HBE feature has been widely associated with the "high energy anomaly" or "waterfall" seen in a number of cuprate photoemission results 11,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] . While the spin polaron is well understood, the characterization remains poor for the feature at higher energies. One may naively expect that a broad, non-dispersive Hubbard band should appear at the Γ-point. However, as shown in Fig. 1, it is clear that there is a sharp dispersion. Previous studies have attributed this feature to scenarios such as spin-charge separation 16,17,34,35,[41][42][43][44][45] or a weak-coupling spin-density wave 9,10,46 . However, these interpretations remain controversial.The aim of this paper is to understand the nature of the HBE feature and what separates it from the SP. Using cluster perturbation theory we examine both the Hubbard, t−J and t−J−3s models to provide an in-depth examination of what controls the quasiparticle dispersion and int...

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“…The transfer of spectral weight from the low energy feature to higher energies occurs somewhere near the middle of the (π, π) to Γ cut. Quite recently, similar behavior has been also found in doped compounds [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 53%

Spin Polarons in Weakly Doped Antiferromagnets: Experimental Evidence Obtained for Cuprates

2008

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The mechanism of spin polaron formation in moderately doped cuprates is discussed. These objects represent holes embedded into heavy clouds formed by spin fluctuations. Wave functions of spin polarons are spatially confined due to the increase in the exchange energy which is induced by hole motion giving rise to the creation of spin fluctuations. These wave functions are eigenstates of an "unperturbed" Hamiltonian which is defined by processes responsible for the tendency toward confinement. The eigenstates transform according to different irreducible representations of the point group reflecting the symmetry of the problem. Thus, the spin polarons being local wave functions resemble orbital states. The spectrum of optical conductivity in the mid-infrared range is determined by transitions between s-wave and p-wave spin polarons. The hybridization between different spin polarons which is induced by some high order processes gives rise to the formation of energy bands. The pronounced transfer of the spectral weight between different bands is induced by the coupling between spin fluctuations created by the hopping hole and local quantum fluctuations in the empty antiferromagnetic background from which an electron has been rejected, for example during the photoemission process. The form of the energy dispersion for spin polarons gives rise to the formation of a small Fermi surface at the low hole-doping range. These three above mentioned phenomena were observed in cuprates which seems to confirm the spin polaron scenario. The discussion of related experiments is the additional objective of this paper.

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High-Energy Scale Revival and Giant Kink in the Dispersion of a Cuprate Superconductor

Cited by 101 publications

References 29 publications

Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data

Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data

Origin of strong dispersion in Hubbard insulators

Spin Polarons in Weakly Doped Antiferromagnets: Experimental Evidence Obtained for Cuprates

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