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

Vig, Sean; Kogar, Anshul; Mitrano, Matteo; Husain, Ali; Venema, Luc; Rak, Mindy; Mishra, Vivek; Johnson, Peter; Gu, Genda; Fradkin, Eduardo; Norman, Michael; Abbamonte, Peter

doi:10.21468/SciPostPhys.3.4.026

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

Journal Article · Fri Oct 06 00:00:00 EDT 2017 · SciPost Physics Proceedings

DOI:https://doi.org/10.21468/SciPostPhys.3.4.026· OSTI ID:1398288

Vig, Sean ^[1]; Kogar, Anshul ^[1];

^[1];

^[1]; Venema, Luc ^[1]; Rak, Mindy ^[1]; Mishra, Vivek ^[2]; Johnson, Peter ^[3]; Gu, Genda ^[3]; Fradkin, Eduardo ^[1]; Norman, Michael ^[4]; Abbamonte, Peter ^[1]

University of Illinois at Urbana Champaign
Oak Ridge National Laboratory
Brookhaven National Laboratory
Argonne National Laboratory

One of the most fundamental properties of an interacting electron system is its frequency- and wave-vector-dependent density response function, \chi({\bf q},\omega) . The imaginary part, \chi''({\bf q},\omega) , defines the fundamental bosonic charge excitations of the system, exhibiting peaks wherever collective modes are present. \chi $χ$ 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 \chi({\bf q},\omega) at the meV energy scale relevant to modern electronic materials. Here, we demonstrate a way to measure \chi $χ$ 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 \chi''({\bf q},\omega) 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 $_{2}$ Sr _2 $_{2}$ CaCu _2 $_{2}$ O _{8+x} $_{8 + x}$ (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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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Energy Frontier Research Center; Center for Emergent Superconductivity; Gordon and Betty Moore Foundation; Alexander von Humboldt Foundation

Grant/Contract Number:: AC02-98CH10886; SC0012368; AC02-06CH11357

OSTI ID:: 1398288

Alternate ID(s):: OSTI ID: 1418460

Journal Information:: SciPost Physics Proceedings, Journal Name: SciPost Physics Proceedings Vol. 3 Journal Issue: 4; ISSN 2542-4653

Publisher:: Stichting SciPostCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 31 works

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