期刊
APPLIED PHYSICS LETTERS
卷 106, 期 23, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4922316
关键词
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资金
- NSF MRSEC program [DMR-1121053]
- NSF [DMR-1006640, CNS-0960316, ACI-1053575]
- Center for Energy Efficient Materials, an Energy Frontier Research Center - DOE [DE-SC0001009]
- ONR [N00014-12-1-0976]
- NSF MRSEC [DMR-1121053]
- Direct For Mathematical & Physical Scien [1006640] Funding Source: National Science Foundation
- Division Of Materials Research [1006640] Funding Source: National Science Foundation
We investigate the behavior of hole polarons in rare-earth titanates by combining optical conductivity measurements with first-principles hybrid density functional calculations. Sr-doped GdTiO3 (Gd1-xSrxTiO3) was grown by molecular beam epitaxy. We show that a feature in the optical conductivity that was previously identified with the Mott-Hubbard gap is actually associated with the excitation of a small polaron. The assignment is based on an excellent match between the experimental spectra and first-principles calculations for polaron excitation mechanisms. (C) 2015 AIP Publishing LLC.
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