Disparate Exciton-Phonon Couplings for Zone-Center and Boundary Phonons in Solid-State Graphite

Xuefei Feng; Shawn Sallis; Yu Cheng Shao; Ruimin Qiao; Yi Sheng Liu; Li Cheng Kao; Anton S. Tremsin; Zahid Hussain; Wanli Yang; Jinghua Guo; Yi De Chuang

doi:10.1103/PHYSREVLETT.125.116401

Disparate Exciton-Phonon Couplings for Zone-Center and Boundary Phonons in Solid-State Graphite

Xuefei Feng, Shawn Sallis, Yu Cheng Shao, Ruimin Qiao, Yi Sheng Liu, Li Cheng Kao, Anton S. Tremsin, Zahid Hussain, Wanli Yang, Jinghua Guo, Yi De Chuang

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The exciton-phonon coupling in highly oriented pyrolytic graphite is studied using resonant inelastic X-ray scattering (RIXS) spectroscopy. With ∼70 meV energy resolution, multiple low energy excitations associated with coupling to phonons can be clearly resolved in the RIXS spectra. Using resonance dependence and the closed form for RIXS cross section without considering the intermediate state mixing of phonon modes, the dimensionless coupling constant g is determined to be 5 and 0.35, corresponding to the coupling strength of 0.42 eV+/-20 meV and 0.20 eV+/-20 meV, for zone center and boundary phonons, respectively. The reduced g value for the zone-boundary phonon may be related to its double resonance nature.

Original language	English
Article number	116401
Journal	Physical review letters
Volume	125
Issue number	11
DOIs	https://doi.org/10.1103/PHYSREVLETT.125.116401
Publication status	Published - 2020 Sept

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PHYSREVLETT.125.116401

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@article{df00572b27fe4fcdb60c85fcb8355c1f,

title = "Disparate Exciton-Phonon Couplings for Zone-Center and Boundary Phonons in Solid-State Graphite",

abstract = "The exciton-phonon coupling in highly oriented pyrolytic graphite is studied using resonant inelastic X-ray scattering (RIXS) spectroscopy. With ∼70 meV energy resolution, multiple low energy excitations associated with coupling to phonons can be clearly resolved in the RIXS spectra. Using resonance dependence and the closed form for RIXS cross section without considering the intermediate state mixing of phonon modes, the dimensionless coupling constant g is determined to be 5 and 0.35, corresponding to the coupling strength of 0.42 eV+/-20 meV and 0.20 eV+/-20 meV, for zone center and boundary phonons, respectively. The reduced g value for the zone-boundary phonon may be related to its double resonance nature.",

author = "Xuefei Feng and Shawn Sallis and Shao, {Yu Cheng} and Ruimin Qiao and Liu, {Yi Sheng} and Kao, {Li Cheng} and Tremsin, {Anton S.} and Zahid Hussain and Wanli Yang and Jinghua Guo and Chuang, {Yi De}",

note = "Funding Information: We thank K. Gilmore, M. X. Na, A. Damascelli, and A. F. Kemper for the insightful discussion. This research used resources of the Advanced Light Source, a U.S. DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. The Timepix detector activity is supported by FWP #RoyTimepixDetector. X. F. acknowledges the support of the Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub funded by the U.S. DOE, office of Science, Basic Energy Sciences. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = sep,

doi = "10.1103/PHYSREVLETT.125.116401",

language = "English",

volume = "125",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "11",

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TY - JOUR

T1 - Disparate Exciton-Phonon Couplings for Zone-Center and Boundary Phonons in Solid-State Graphite

AU - Feng, Xuefei

AU - Sallis, Shawn

AU - Shao, Yu Cheng

AU - Qiao, Ruimin

AU - Liu, Yi Sheng

AU - Kao, Li Cheng

AU - Tremsin, Anton S.

AU - Hussain, Zahid

AU - Yang, Wanli

AU - Guo, Jinghua

AU - Chuang, Yi De

N1 - Funding Information: We thank K. Gilmore, M. X. Na, A. Damascelli, and A. F. Kemper for the insightful discussion. This research used resources of the Advanced Light Source, a U.S. DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. The Timepix detector activity is supported by FWP #RoyTimepixDetector. X. F. acknowledges the support of the Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub funded by the U.S. DOE, office of Science, Basic Energy Sciences. Publisher Copyright: © 2020 American Physical Society.

PY - 2020/9

Y1 - 2020/9

N2 - The exciton-phonon coupling in highly oriented pyrolytic graphite is studied using resonant inelastic X-ray scattering (RIXS) spectroscopy. With ∼70 meV energy resolution, multiple low energy excitations associated with coupling to phonons can be clearly resolved in the RIXS spectra. Using resonance dependence and the closed form for RIXS cross section without considering the intermediate state mixing of phonon modes, the dimensionless coupling constant g is determined to be 5 and 0.35, corresponding to the coupling strength of 0.42 eV+/-20 meV and 0.20 eV+/-20 meV, for zone center and boundary phonons, respectively. The reduced g value for the zone-boundary phonon may be related to its double resonance nature.

AB - The exciton-phonon coupling in highly oriented pyrolytic graphite is studied using resonant inelastic X-ray scattering (RIXS) spectroscopy. With ∼70 meV energy resolution, multiple low energy excitations associated with coupling to phonons can be clearly resolved in the RIXS spectra. Using resonance dependence and the closed form for RIXS cross section without considering the intermediate state mixing of phonon modes, the dimensionless coupling constant g is determined to be 5 and 0.35, corresponding to the coupling strength of 0.42 eV+/-20 meV and 0.20 eV+/-20 meV, for zone center and boundary phonons, respectively. The reduced g value for the zone-boundary phonon may be related to its double resonance nature.

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SN - 0031-9007

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JO - Physical review letters

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Disparate Exciton-Phonon Couplings for Zone-Center and Boundary Phonons in Solid-State Graphite

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