Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering

Nag, Abhishek; Zhu, Mengze; Bejas, Matías; Li, J.; Robarts, H. C.; Yamase, Hiroyuki; Petsch, Alexander N.; Song, Dongjoon; Eisaki, H.; Walters, A. C.; García-Fernández, Mirian; Greco, A.; Hayden, Stephen M; Zhou, Kejin

doi:10.1103/physrevlett.125.257002

Cited by 61 publications

(65 citation statements)

References 52 publications

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“…In his Comment [10], Jörg Fink claims our results contradict optical [11], resonant inelastic x-ray scattering (RIXS) [12], and transmission EELS (T-EELS) [5,6] studies. The author claims we compute our momentum incorrectly, failing to account for the energy change of the scattered electron, resulting in an incorrect value for q = k i − k f , where |k f | = 2mE f / , during an energyloss scan.…”

Section: Introductionmentioning

confidence: 62%

“…In the case of Bi-2201, which is the closest proxy for Bi-2212 currently available from RIXS, the acoustic plasmon is highly damped and not clearly visible for q > 0.1 r.l.u. [12]. Note that RIXS measurements have not yet observed the 1 eV plasmon seen in optics, which should be visible at out-of-plane momentum L = 2.0 r.l.u.…”

Section: Consistency Between M-eels Optics and Rixsmentioning

confidence: 96%

“…where its energy is 0.84 eV (see Figs 4(a) and S12(e) of Ref. [12]). Because its width is comparable to its energy, it is appropriate to say that this acoustic plasmon is highly damped.…”

Section: Consistency Between M-eels Optics and Rixsmentioning

confidence: 98%

“…More recently, RIXS studies of hole-doped cuprates have revealed dispersive, out-of-plane acoustic plasmon excitations in the low-momentum regime, q < 0.15 r.l.u. [12,18]. In the case of Bi-2201, which is the closest proxy for Bi-2212 currently available from RIXS, the acoustic plasmon is highly damped and not clearly visible for q > 0.1 r.l.u.…”

Section: Consistency Between M-eels Optics and Rixsmentioning

confidence: 99%

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Crossover of Charge Fluctuations across the Strange Metal Phase Diagram

et al. 2019

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A normal metal exhibits a valence plasmon, which is a sound wave in its conduction electron density. The mysterious strange metal is characterized by non-Boltzmann transport and violates most fundamental Fermi liquid scaling laws. A fundamental question is: Do strange metals have plasmons? Using momentum-resolved inelastic electron scattering (M-EELS) we recently showed that, rather than a plasmon, optimally-doped Bi2.1Sr1.9Ca1.0Cu2.0O8+x (Bi-2212) exhibits a featureless, temperature-independent continuum with a power-law form over most energy and momentum scales [M. Mitrano, PNAS 115, 5392-5396 (2018)]. Here, we show that this continuum is present throughout the fan-shaped, strange metal region of the phase diagram. Outside this region, dramatic changes in spectral weight are observed: In underdoped samples, spectral weight up to 0.5 eV is enhanced at low temperature, biasing the system towards a charge order instability. The situation is reversed in the overdoped case, where spectral weight is strongly suppressed at low temperature, increasing quasiparticle coherence in this regime. Optimal doping corresponds to the boundary between these two opposite behaviors at which the response is temperature-independent. Our study suggests that plasmons do not exist as well-defined excitations in Bi-2212, and that a featureless continuum is a defining property of the strange metal, which is connected to a peculiar crossover where the spectral weight change undergoes a sign reversal. arXiv:1903.04038v2 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 62%

Section: Consistency Between M-eels Optics and Rixsmentioning

confidence: 96%

“…where its energy is 0.84 eV (see Figs 4(a) and S12(e) of Ref. [12]). Because its width is comparable to its energy, it is appropriate to say that this acoustic plasmon is highly damped.…”

Section: Consistency Between M-eels Optics and Rixsmentioning

confidence: 98%

Section: Consistency Between M-eels Optics and Rixsmentioning

confidence: 99%

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Crossover of Charge Fluctuations across the Strange Metal Phase Diagram

et al. 2019

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“…The origin of high-energy charge excitations in h-cuprates [27] is also highly controversial. High-energy excitations can be (i) specific to e-cuprates [7,10], (ii) present as a broad peak of the particle-hole excitation spectrum [27], (iii) present as plasmons similar to the e-cuprates [11,12,17,28,29], and (iv) related to strange metal physics [30,31], not to plasmons.…”

Section: Introductionmentioning

confidence: 99%

Electron self-energy from quantum charge fluctuations in the layered t−J model with long-range Coulomb interaction

2021

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Employing a large-N scheme of the layered t-J model with the long-range Coulomb interaction, which captures the fine details of the charge excitation spectra recently observed in cuprate superconductors, we explore the role of charge fluctuations on the electron self-energy. We fix the temperature at zero and focus on quantum charge fluctuations. We find a pronounced asymmetry of the imaginary part of the self-energy Im (k, ω) with respect to ω = 0, which is driven by strong electron correlation effects. The quasiparticle weight is reduced dramatically, which occurs almost isotropically along the Fermi surface. Concomitantly, an incoherent band and a sharp side band are generated and acquire sizable spectral weight. All these features are driven by the usual on-site charge fluctuations, which are realized in a rather high-energy region and yield plasmon excitations. On the other hand, the low-energy region with the scale of the superexchange interaction J is dominated by bond-charge fluctuations. Surprisingly, compared with the effect of on-site charge fluctuations, their effect on the electron self-energy is much weaker, even if the system approaches close to bond-charge instabilities. Furthermore, quantum charge dynamics does not produce a clear kink nor a pseudogap in the electron dispersion.

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