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Title: Resonant inelastic x-ray scattering in metals: A diagrammatic approach

Abstract

We create a formalism to explore the Resonant Inelastic X-ray Scattering (RIXS) response in metals based on the diagrammatic expansion for its cross section. The standard method to the solution of the RIXS problem relies on two key approximations: short-range potentials and non-interacting conduction electrons. Yet, these approximations are inaccurate for charged particles in metals, where the long-range Coulomb interaction and dynamic screening effects are very important. Here, we study how to extract important information about collective excitations in the Coulomb plasma, plasmons and electron-hole pairs, from RIXS data. We find that single- and multi-plasmon excitations can easily be distinguished by positions of the corresponding peaks, singularities, and their intensities. We also discuss the hybrid processes, where plasmon emission is accompanied by excitation of electron-hole pairs, and study how they manifest themselves.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1573866
Alternate Identifier(s):
OSTI ID: 1571406
Report Number(s):
BNL-212219-2019-JAAM
Journal ID: ISSN 2643-1564; PPRHAI; 033093
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 1 Journal Issue: 3; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Tsvelik, A. M., Konik, R. M., Prokof'ev, N. V., and Tupitsyn, I. S. Resonant inelastic x-ray scattering in metals: A diagrammatic approach. United States: N. p., 2019. Web. doi:10.1103/PhysRevResearch.1.033093.
Tsvelik, A. M., Konik, R. M., Prokof'ev, N. V., & Tupitsyn, I. S. Resonant inelastic x-ray scattering in metals: A diagrammatic approach. United States. https://doi.org/10.1103/PhysRevResearch.1.033093
Tsvelik, A. M., Konik, R. M., Prokof'ev, N. V., and Tupitsyn, I. S. Mon . "Resonant inelastic x-ray scattering in metals: A diagrammatic approach". United States. https://doi.org/10.1103/PhysRevResearch.1.033093.
@article{osti_1573866,
title = {Resonant inelastic x-ray scattering in metals: A diagrammatic approach},
author = {Tsvelik, A. M. and Konik, R. M. and Prokof'ev, N. V. and Tupitsyn, I. S.},
abstractNote = {We create a formalism to explore the Resonant Inelastic X-ray Scattering (RIXS) response in metals based on the diagrammatic expansion for its cross section. The standard method to the solution of the RIXS problem relies on two key approximations: short-range potentials and non-interacting conduction electrons. Yet, these approximations are inaccurate for charged particles in metals, where the long-range Coulomb interaction and dynamic screening effects are very important. Here, we study how to extract important information about collective excitations in the Coulomb plasma, plasmons and electron-hole pairs, from RIXS data. We find that single- and multi-plasmon excitations can easily be distinguished by positions of the corresponding peaks, singularities, and their intensities. We also discuss the hybrid processes, where plasmon emission is accompanied by excitation of electron-hole pairs, and study how they manifest themselves.},
doi = {10.1103/PhysRevResearch.1.033093},
journal = {Physical Review Research},
number = 3,
volume = 1,
place = {United States},
year = {Mon Nov 11 00:00:00 EST 2019},
month = {Mon Nov 11 00:00:00 EST 2019}
}

Journal Article:
Free Publicly Available Full Text

Figures / Tables:

FIG. 1 FIG. 1: (a) The lowest-order diagram for the indirect RIXS cross-section where the s-hole excites charge density fluctuations in the d-shell (the internal fermionic bubble) via the Coulomb potential VQ (dashed lines). (ωi,qi)/(ωf ,qf ) are the frequencies and momenta of incoming/outgoing photons. Energy and momentum transfer to the systemmore » are defined by Ω = ωiωf and Q = qiqf , respectively. (b) The Dyson equation for the screened dynamic interaction U obtained by summing up bubble diagrams based on VQ and the polarization function, Π, of d-electrons. (c) The lowest-order diagram for the indirect RIXS cross-section in terms of U .« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.