Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.247401
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Funding
- MEXT, Japan [20104006]
- Grants-in-Aid for Scientific Research [20104006] Funding Source: KAKEN
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We report unusual photoluminescence (PL) behaviors in highly photoexcited SrTiO3 crystals at low temperatures. The PL spectrum and dynamics show abrupt changes below 150 K in both nondoped and electron-doped SrTiO3 samples. We clarified that the PL dynamics in both nondoped and electron-doped SrTiO3 is well described by the same simple model involving single-carrier trapping, radiative bimolecular recombination, and nonradiative Auger recombination. The unusual temperature dependence of PL dynamics is caused by the crossover from Auger recombination at high temperatures to single-carrier trapping at low temperatures. We discuss the temperature-dependent PL dynamics in conjunction with the high carrier mobility of SrTiO3 at low temperatures.
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