Electron-Phonon Coupling in the Bulk of Anatase TiO2 Measured by Resonant Inelastic X-Ray Spectroscopy

We investigate the polaronic ground state of anatase TiO2 by bulk-sensitive resonant inelastic x-ray spectroscopy (RIXS) at the Ti L3 edge. We find that the formation of the polaron cloud involves a single 95 meV phonon along the c axis, in addition to the 108 meV ab-plane mode previously identified...

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Bibliographic Details
Published in:Physical review letters 2015-08, Vol.115 (9), p.096404-096404
Main Authors: Moser, S, Fatale, S, Krüger, P, Berger, H, Bugnon, P, Magrez, A, Niwa, H, Miyawaki, J, Harada, Y, Grioni, M
Format: Article
Language:English
Subjects:
Anatase
Bars
Ground state
Joining
Photoemission
Spectroscopy
Titanium dioxide
X-rays
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Summary:We investigate the polaronic ground state of anatase TiO2 by bulk-sensitive resonant inelastic x-ray spectroscopy (RIXS) at the Ti L3 edge. We find that the formation of the polaron cloud involves a single 95 meV phonon along the c axis, in addition to the 108 meV ab-plane mode previously identified by photoemission. The coupling strength to both modes is the same within error bars, and it is unaffected by the carrier density. These data establish RIXS as a directional bulk-sensitive probe of electron-phonon coupling in solids.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.096404