Self-energy and fluctuation spectra in cuprates: Comparing optical and photoemission results

Markiewicz, R. S.; Das, Tanmoy; Bansil, Arun

doi:10.1103/physrevb.86.024511

Cited by 8 publications

(10 citation statements)

References 95 publications

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“…Figure 38(b) shows that the combination of spin and charge glue functions qualitatively reproduces the glue function extracted directly from the optical spectrum, including a significant contribution near 1 eV. Differences above 1 eV may be due to limitations in extracting the true Σ from Σ op as discussed in Ref, [376]. The contribution of the loss function to the optical glue has not been recognized previously.…”

Section: Application To Bi2212mentioning

confidence: 52%

Intermediate coupling model of the cuprates

Das

Markiewicz

Bansil

2014

Advances in Physics

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We review the intermediate coupling model for treating electronic correlations in the cuprates. Spectral signatures of the intermediate coupling scenario are identified and used to adduce that the cuprates fall in the intermediate rather than the weak or the strong coupling limits. A robust, 'beyond LDA' framework for obtaining wide-ranging properties of the cuprates via a GW-approximation based self-consistent self-energy correction for incorporating correlation effects is delineated. In this way, doping and temperature dependent spectra, from the undoped insulator to the overdoped metal, in the normal as well as the superconducting state, with features of both weak and strong coupling can be modeled in a material-specific manner with very few parameters. Efficacy of the model is shown by considering available spectroscopic data on electron and hole doped cuprates from angle-resolved photoemission (ARPES), scanning tunneling microscopy/spectroscopy (STM/STS), neutron scattering, inelastic light scattering, optical and other experiments. Generalizations to treat systems with multiple correlated bands such as the heavy-fermions, the ruthenates, and the actinides are discussed.

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Section: Application To Bi2212mentioning

confidence: 52%

Intermediate coupling model of the cuprates

Das

Markiewicz

Bansil

2014

Advances in Physics

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“…The continuous lines are the data and dash-dotted our maximum entropy fits. The middle column gives the recovered boson spectral density I 2 χ(ω) when we use the band structure density of states obtained by LDA which was presented in the work of Markiewicz et al [23] while the right column presents similar data obtained assuming a constant DOS and is for comparison. The particle-hole symmetrized LDA DOS used is reproduced in the inset on the top frame of Fig.…”

Section: Numerical Resultsmentioning

confidence: 96%

“…The particle-hole symmetrized LDA DOS used is reproduced in the inset on the top frame of Fig. 2 from reference [23]. These authors calculate the charge and spin susceptibilities for Bi-2212 and argue that the fluctuation spectrum extends over the full band width of ≥ 2.0 eV in this material.…”

Section: Numerical Resultsmentioning

confidence: 99%

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High-energy fluctuation spectra in cuprates from infrared optical spectroscopy

Hwang

Ćarbotte

2014

Phys. Rev. B

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Coupling of the charge carriers in the high temperature superconducting oxides to bosonic modes has been widely reported using a variety of experimental probes. These include angular resolved photoemission (ARPES), scanning tunnelling spectroscopy (STS), Raman scattering (RS) and infrared optical spectroscopy (IRS). The energy scale investigated has been mostly limited to a relatively small range up to 300 meV or so. Although some ARPES experiments report boson structure up to 800 meV in the dressed electron dispersion curves the data are not analyzed to recover the spectral density of the fluctuation spectrum. We have extended to higher energies up to 2.2 eV the usual maximum entropy technique used to invert optical data so as to obtain an electron-boson spectral density. This has required that we include in our inversions, the calculated (LDA) particle-hole symmetrized energy dependent electronic density of states (DOS). Our analysis reveals that significant spectral weight remains in the fluctuation spectra up to 2.2 eV in the Bi-2212 family and to 1.2 eV in Bi-2201 for all doping levels considered.

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“…Note that the EP coupling in the SC channel, λ, is different from the EP coupling constant for the single particle spectrum λ qp = Z −1 − 1, where Z −1 = 1 − (∂Σ /∂ω) ω=0 , that one often obtains from the quasiparicle self-energy. 35 The Coulomb pseudopotential µ * 0 is often taken as a parameter, however, the evolution of it in correlated system and as a function of doping can be estimated as…”

Section: Quasiparticle-phonon Coupling and T C Calculationmentioning

confidence: 99%

Superconducting dome inMoS2andTiSe2generated by quasiparticle-phonon coupling

Das

Dolui

2015

Phys. Rev. B

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We use a first-principles based self-consistent momentum-resolved density fluctuation (MRDF) model to compute the combined effects of electron-electron and electron-phonon interactions to describe the superconducting dome in the correlated MoS 2 thin flake and TiSe 2 . We find that without including the electron-electron interaction, the electron-phonon coupling and the superconducting transition temperature (T c ) are overestimated in both these materials. However, once the full angular and dynamical fluctuations of the spin and charge density induced quasiparticle self-energy effects are included, the electron-phonon coupling and T c are reduced to the experimental value. With doping, both electronic correlation and electron-phonon coupling grows, and above some doping value, the former becomes so large that it starts to reduce the quasiparticle-phonon coupling constant and T c , creating a superconducting dome, in agreement with experiments.

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Self-energy and fluctuation spectra in cuprates: Comparing optical and photoemission results

Cited by 8 publications

References 95 publications

Intermediate coupling model of the cuprates

Intermediate coupling model of the cuprates

High-energy fluctuation spectra in cuprates from infrared optical spectroscopy

Superconducting dome inMoS2andTiSe2generated by quasiparticle-phonon coupling

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