Inversion of angle-resolved photoemission measurements in high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>cuprates

Verga, Simona; Knigavko, A.; Marsiglio, F.

doi:10.1103/physrevb.67.054503

Cited by 37 publications

(33 citation statements)

References 12 publications

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“…This has given rise to intense theoretical work focusing on the excitation spectra in the presence of electron-boson interactions, both in models with [5,6,7] and without [8,9,10,11,12,13] electronic correlations. Of particular interest are those works which focus on isotope effects (IE), since they can disentangle the properties which are directly related to the coupling to the lattice degrees of freedom.…”

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confidence: 99%

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator versus polaronic semiconductor

Fratini

Ciuchi

2005

Phys. Rev. B

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We study the electronic spectral properties in two examples of strongly interacting systems: a Mott-Hubbard insulator with additional electron-boson interactions, and a polaronic semiconductor. An approximate unified framework is developed for the high energy part of the spectrum, in which the electrons move in a random field determined by the interplay between magnetic and bosonic fluctuations. When the boson under consideration is a lattice vibration, the resulting isotope effect on the spectral properties is similar in both cases, being strongly temperature and energy dependent, in qualitative agreement with recent photoemission experiments in the cuprates.

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confidence: 99%

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator versus polaronic semiconductor

Fratini

Ciuchi

2005

Phys. Rev. B

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“…Note that in Eq. (11) the self energy has a logarithmic divergence at ω = ω E and this leads to a singular structure in E k at that energy as has been investigated in detail by Verga et al 49 to which the reader is referred for details. Here we have chosen to emphasize instead the nature of the structure in the imaginary part.…”

Section: General Resultsmentioning

confidence: 92%

Angle-resolved photoemission spectroscopy and optical renormalizations: Phonons or spin fluctuations

Schachinger

Ćarbotte

2003

Phys. Rev. B

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Improved resolution in both, energy and momentum in ARPES-data has lead to the establishment of a definite energy scale in the dressed quasiparticle dispersion relations. The observed structure around 80 meV has been taken as evidence for coupling to phonons and has re-focused the debate about the mechanism of superconductivity in the cuprates. Here we address the relative merits of phonon as opposed to spin fluctuation mechanisms. Both possibilities are consistent with ARPES. On the other hand, when the considerations are extended to infrared optical data, a spin fluctuation mechanism provides a more natural interpretation of the combined sets of data in Bi2Sr2Ca Cu2O 8+δ (Bi2212).

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“…In panel c we show the real part of the electron self energy, Re Σ(k, ω), vs binding energy in the same temperature range as in previous panels. The ReΣ(k, ω) is defined as the difference between the measured (dressed) quasiparticle dispersion, and the bare dispersion, ǫ(k) [23]. Here we approximate the bare dispersion by a straight line connecting k F and the dispersion at high energy 300meV, see dotted lines in panel a), following a previous convention [12].…”

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“…The broadening of the ReΣ(k, ω) can also be predicted within an Eliashberg type electron-boson model, see ref. [23]. It is important to point out that, in the case of Bi2212, the broadening of the ReΣ(k, ω) and the disappearance of the sharp peak at low energy, have been considered compelling evidence against a electron-boson interacting picture, where the broad hump in the ReΣ(k, ω) is now purely dominated by electron-electron interaction [12,28].…”

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“…The kink position is extracted using two correlated methods: 1) the maximum position of the ReΣ(k, ω) (circles) [23]; 2) the energy intersection between the straight line fit for the low and high energy part of the dispersion [10] (squares). The data show a slight temperature dependent increase of the kink position, as explained in simple electron-boson picture [23]. The large error bars at high temperatures are due to the broader peaks with respect to the low temperature data.…”

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Normal state spectral lineshapes of nodal quasiparticles in single layer Bi2201 superconductor

Lanzara

Bogdanov

Zhou

et al. 2006

Journal of Physics and Chemistry of Solids

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A detailed study of the normal state photoemission lineshapes and quasiparticle dispersion for the single layer Bi2Sr2−xLaxCuO 6+δ (Bi2201) superconductor is presented. We report the first experimental evidence of a double peak structure and a dip of spectral intensity in the energy distribution curves (EDCs) along the nodal direction. The double peak structure is well identified in the normal state, up to ten times the critical temperature. As a result of the same self-energy effect, a strong mass renormalization of the quasiparticle dispersion, i.e. kink, and an increase of the quasiparticle lifetime in the normal state are also observed. Our results provide unambiguous evidence on the existence of bosonic excitation in the normal state, and support a picture where nodal quasiparticles are strongly coupled to the lattice. PACS numbers: 74.25.Jb, As a measure of the imaginary part of the single particle Green's function, photoelectron spectroscopy provides insights on the scattering processes that play a key role for the physical properties of a material. In a metallic system for example, the coupling of quasiparticles to phonons causes the photoemission line shape to evolve from a single Lorentzian-like peak, as for a Fermi liquid picture, to double or multiple peak structures [2] with a dip of spectral intensity, which correspond to the phonons energy. The coupling to phonon, or more in general to any bosonic excitation, is also reflected in a renormalization of the quasiparticle dispersion, and in an increase of the quasiparticle lifetime below the phonon energy [3]. In the framework of quasiparticles coupled to a bosonic excitation these behaviors are the result of the same selfenergy effect, Σ(k, ω), and occur at a similar energy scale [4].This textbook behavior has been recently measured by angle resolved photoemission spectroscopy (ARPES) in several systems characterized by a strong electronphonon interaction, such as Be [5], Mo [6], W [7] and C 60 [8]. Similar behavior has also been observed in several families of p-type cuprates along the nodal direction, (0, 0) to (π, π) [9,10,11,12,13,14,15,16]. While in the case of simple metals the interpretation is straightforward and phonons are easily identified as the relevant energy scale, the interpretation is far more complex in the case of strongly correlated systems as cuprates superconductors. Although the experimental data between different groups are in agreement, and are in favor of a scenario of quasiparticles coupled to bosonic modes, the nature of such excitations is still highly controversial and has been matter of intense study over the last few years.The two proposed scenarios see quasiparticles coupled to phonons [10,11] vs quasiparticles coupled to an electronic mode [12,13,14,15,16]. On the basis of energy scale it has been argued that, the highest energy phonon coupled to quasiparticle is the in plane half-breathing oxygen phonons [17,18], while the relevant electronic mode is the (π, π) resonance mode, observed by neutron scattering [19,20]....

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Inversion of angle-resolved photoemission measurements in high-Tccuprates

Cited by 37 publications

References 12 publications

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator versus polaronic semiconductor

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator versus polaronic semiconductor

Angle-resolved photoemission spectroscopy and optical renormalizations: Phonons or spin fluctuations

Normal state spectral lineshapes of nodal quasiparticles in single layer Bi2201 superconductor

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