Photoemission studies of self-energy effects in cuprate superconductors

Johnson, P. D.; Fedorov, A. V.; Valla, T.

doi:10.1016/s0368-2048(01)00263-8

Cited by 17 publications

(15 citation statements)

References 54 publications

(30 reference statements)

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“…6c. The agreement between the calculated and experimental curves is excellent and gives an estimate for the energy-and momentum-integrated electron-phonon coupling constant of λ = v F /v 0 F −1 = 0.7, which is in line with previous estimates [64]. We conclude that the bosonic modes observed with M-EELS have the correct energy structure to explain the ARPES kinks, and may be part of the cause of these effects.…”

Section: Self-energy Effectssupporting

confidence: 89%

Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)

et al. 2017

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One of the most fundamental properties of an interacting electron system is its frequency-and wave-vector-dependent density response function, χ(q, ω). The imaginary part, χ (q, ω), defines the fundamental bosonic charge excitations of the system, exhibiting peaks wherever collective modes are present. χ quantifies the electronic compressibility of a material, its response to external fields, its ability to screen charge, and its tendency to form charge density waves. Unfortunately, there has never been a fully momentum-resolved means to measure χ(q, ω) at the meV energy scale relevant to modern electronic materials. Here, we demonstrate a way to measure χ with quantitative momentum resolution by applying alignment techniques from x-ray and neutron scattering to surface high-resolution electron energy-loss spectroscopy (HR-EELS). This approach, which we refer to here as "M-EELS", allows direct measurement of χ (q, ω) with meV resolution while controlling the momentum with an accuracy better than a percent of a typical Brillouin zone. We apply this technique to finite-q excitations in the optimally-doped high temperature superconductor, Bi 2 Sr 2 CaCu 2 O 8+x (Bi2212), which exhibits several phonons potentially relevant to dispersion anomalies observed in ARPES and STM experiments. Our study defines a path to studying the long-sought collective charge modes in quantum materials at the meV scale and with full momentum control.

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Section: Self-energy Effectssupporting

confidence: 89%

Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)

et al. 2017

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“…2 and (iv) k is the bare electronic dispersion [58][59][60][61] . For the most generic case, obtaining Σ and Σ from ARPES data is a challenging task since Σ and Σ are functions of both k and ω.…”

Section: B Multiple Kinks In Band Dispersionmentioning

confidence: 99%

Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS₂

et al. 2017

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Our detailed Angle Resolved Photoemission Spectroscopy (ARPES) study of 2H-TaS2 , a canonical incommensurate charge density wave (CDW) material, illustrates pronounced many-body renormalization in the system, which is manifested by the presence of multiple kink structures in the electronic dispersions. Temperature-dependent measurements reveal that these kink structures persist even at temperatures higher than the charge density wave transition temperature T cdw and the energy locations of the kinks are practically temperature-independent. Correlating kink energies with the published Raman scattering data and the theoretically calculated phonon spectrum of 2H-TaS2 , we conclude phononic mechanism for these kinks. We have also detected momentum-anisotropy in the band renormalization, which in turn indicates momentum-dependence of the electron-phonon coupling of the system. arXiv:1805.03580v1 [cond-mat.str-el]

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“…Fig. 12(a) shows the nodal band dispersion above and well below T c in optimally doped Bi-2212, which is found by standard momentum distribution curve (MDC) analysis, [55] and ReΣ is approximated by subtracting an assumed linear bare band from the measured band dispersion. ReΣ at both 15K and 104K, shown in Fig.…”

Section: Low-energy Nodal Excitationsmentioning

confidence: 99%

ARPES studies of cuprate Fermiology: superconductivity, pseudogap and quasiparticle dynamics

et al. 2010

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We present angle-resolved photoemission spectroscopy (ARPES) studies of the cuprate hightemperature superconductors which elucidate the relation between superconductivity and the pseudogap and highlight low-energy quasiparticle dynamics in the superconducting state. Our experiments suggest that the pseudogap and superconducting gap represent distinct states, which coexist below T c . Studies on Bi-2212 demonstrate that the near-nodal and near-antinodal regions behave differently as a function of temperature and doping, implying that different orders dominate in different momentum-space regions. However, the ubiquity of sharp quasiparticles all around the Fermi surface in Bi-2212 indicates that superconductivity extends into the momentum-space region dominated by the pseudogap, revealing subtlety in this dichotomy. In Bi-2201, the temperature dependence of antinodal spectra reveals particle-hole asymmetry and anomalous spectral broadening, which may constrain the explanation for the pseudogap. Recognizing that electron-boson coupling is an important aspect of cuprate physics, we close with a discussion of the multiple 'kinks' in the nodal dispersion. Understanding these may be important to establishing which excitations are important to superconductivity. PACS numbers:1 arXiv:1009.0274v1 [cond-mat.supr-con] 1 Sep 2010

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Photoemission studies of self-energy effects in cuprate superconductors

Cited by 17 publications

References 54 publications

Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)

Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)

Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS₂

ARPES studies of cuprate Fermiology: superconductivity, pseudogap and quasiparticle dynamics

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Photoemission studies of self-energy effects in cuprate superconductors

Cited by 17 publications

References 54 publications

Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)

Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)

Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS2

ARPES studies of cuprate Fermiology: superconductivity, pseudogap and quasiparticle dynamics

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Spectroscopic signature of moment-dependent electron–phonon coupling in 2H-TaS₂