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Collective charge excitations studied by electron energy-loss spectroscopy

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arxiv 2404.04670 v1 pith:AH3KKQUF submitted 2024-04-06 cond-mat.str-el

Peter Abbamonte , Jörg Fink This is my paper · ORCID
classification cond-mat.str-el
keywords chargeeelselectroncollectivecurrentcurrentlyenergy-lossmeasurements
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abstract

The dynamic charge susceptibility, $\chi(q,\omega)$, is a fundamental observable of all materials, in one, two, and three dimensions, quantifying the collective charge modes, the ability of a material to screen charge, as well as its electronic compressibility. Here, we review the current state of efforts to measure this quantity using inelastic electron scattering, which historically has been called electron energy-loss spectroscopy (EELS). We focus on comparison between transmission (T-EELS) and reflection (R-EELS) geometries as applied to a selection of 3D conductors. While a great deal is understood about simple metals, measurements of more strongly interacting and strange metals are currently contradictory, with different groups obtaining fundamentally conflicting results, emphasizing the importance of improved EELS measurements. Further, current opportunities for improvement in EELS techniques are vast, with the most promising future developments being in hemispherical and time-of-flight analyzers, as well as STEM instruments configured for high momentum resolution. We conclude that, despite more than half a century of work, EELS techniques are currently still in their infancy

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Conformally invariant charge fluctuations in a strange metal

    cond-mat.str-el 2024-11 conditional novelty 7.0 of 10

    M-EELS measurements of Bi-2212 find chi''(q,omega) = T^-0.93 f(omega/T), consistent with conformal invariance with conformal dimension Delta = 0.05 in the strange metal phase.

  2. Comparative analysis of plasmon modes in layered Lindhard metals and strange metals

    cond-mat.str-el 2025-07 reject novelty 6.0 of 10

    An IR-derived, momentum-independent layer polarizability predicts a single damped plasmon and no surface mode in T-EELS of Bi-2212, in disagreement with published finite-momentum EELS.

  3. Ghost Josephson plasmon in bilayer superconductors

    cond-mat.supr-con 2024-12 conditional novelty 6.0 of 10

    In bilayer superconductors, the lower Josephson plasmon is a c-axis-polarized, counterflowing current mode whose spectral weight vanishes at zero out-of-plane momentum, which is why it appears as a ghost.

  4. Measurement of the dynamic charge susceptibility near the charge density wave transition in ErTe$_3$

    cond-mat.str-el 2024-11 conditional novelty 6.0 of 10

    M-EELS measurements of ErTe3 reveal relaxational, diffusive charge dynamics near the CDW transition and a static charge susceptibility that increases with decreasing temperature, but no actual divergence.

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