Title: Probing Electron-Phonon Interactions Away from the Fermi Level with Resonant Inelastic X-Ray Scattering

Abstract

Interactions between electrons and lattice vibrations are responsible for a wide range of material properties and applications. Recently, there has been considerable interest in the development of resonant inelastic x-ray scattering (RIXS) as a tool for measuring electron-phonon (e-ph) interactions. Here, we demonstrate the ability of RIXS to probe the interaction between phonons and specific electronic states both near to, and away from, the Fermi level. We performed carbon Kedge RIXS measurements on graphite, tuning the incident x-ray energy to separately probe the interactions of the π* and σ* electronic states. Our high-resolution data reveals detailed structure in the multi-phonon RIXS features that directly encodes the momentum dependence of the e-ph interaction strength. We develop a Green’s-function method to model this structure, which naturally accounts for the phonon and interaction-strength dispersions, as well as the mixing of phonon momenta in the intermediate state. This model shows that the differences between the spectra can be fully explained by contrasting trends of the e-ph interaction through the Brillouin zone, being concentrated at the Γ and K points for the π* states, while being significant at all momenta for the σ* states. Our results advance the interpretation of phonon excitations in RIXS, andmore » extend its applicability as a probe of e-ph interactions to a new range of out-of-equilibrium situations.« less

Authors:

Dashwood, C. D. ;

• Search DOE PAGES for author "Dashwood, C. D."
• Search DOE PAGES for ORCID "0000-0002-1582-3945"

Geondzhian, A.; Vale, J. G.; Pakpour-Tabrizi, A. C.; Howard, C. A. ;

• Search DOE PAGES for author "Howard, C. A."
• Search DOE PAGES for ORCID "0000-0003-2550-0012"

Faure, Q.; Veiga, L. S. I.; Meyers, D.; Chiuzbăian, S. G. ;

• Search DOE PAGES for author "Chiuzbăian, S. G."
• Search DOE PAGES for ORCID "0000-0001-5847-504X"

Nicolaou, A. ;

• Search DOE PAGES for author "Nicolaou, A."
• Search DOE PAGES for ORCID "0000-0001-7348-5369"

Jaouen, N. ;

• Search DOE PAGES for author "Jaouen, N."
• Search DOE PAGES for ORCID "0000-0003-1781-7669"

Jackman, R. B. ;

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• Search DOE PAGES for ORCID "0000-0002-1930-478X"

Nag, A. ;

• Search DOE PAGES for author "Nag, A."
• Search DOE PAGES for ORCID "0000-0002-1394-5105"

García-Fernández, M.; Zhou, Ke-Jin; Walters, A. C. ;

• Search DOE PAGES for author "Walters, A. C."
• Search DOE PAGES for ORCID "0000-0001-9822-3859"

Gilmore, K. ;

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• Search DOE PAGES for ORCID "0000-0002-9231-3551"

McMorrow, D. F.; Dean, M. P. M.

• Search DOE PAGES for author "Dean, M. P. M."
• Search DOE PAGES for ORCID "0000-0001-5139-3543"

Publication Date:

Wed Dec 15 00:00:00 EST 2021

Research Org.:

Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Research Foundation of Korea (NRF); Engineering and Physical Sciences Research Council (EPSRC)

OSTI Identifier:

1835917

Alternate Identifier(s):

OSTI ID: 1839202

Report Number(s):

BNL-222598-2022-JAAM
Journal ID: ISSN 2160-3308; PRXHAE; 041052

Grant/Contract Number:  

SC0012704; DMR-1904716; 2016K1A4A4A01922028; EP/L015277/1; EP/N027671/1; EP/N034872/1; EP/H020055/1; EP/N004159/1

Resource Type:

Published Article

Journal Name:

Physical Review. X

Additional Journal Information:

Journal Name: Physical Review. X Journal Volume: 11 Journal Issue: 4; Journal ID: ISSN 2160-3308

Publisher:

American Physical Society

Country of Publication:

United States

Language:

English

Subject:

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY