Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.4923320
Title: Temperature dependence of photoluminescence spectra of bilayer two-dimensional electron gases in LaAlO3/SrTiO3 superlattices: Coexistence of Auger recombination and single-carrier trapping
Authors: Ma, H.J.H
Venkatesan, T 
Wang, S.J 
Ariando, NUSNNI-Nanocore, National University of Singapore117411, Singapore, Department of Physics, National University of Singapore117542, Singapore 
Keywords: Augers
Electron gas
Electron traps
Lanthanum alloys
Photoluminescence
Superlattices
Temperature distribution
Two dimensional electron gas
Auger recombination
Conducting channels
High temperature
Photoluminescence spectrum
Temperature dependence
Temperature dependent
Temperature independents
Two-dimensional electron gases (2DEG)
Electrons
Issue Date: 2015
Citation: Ma, H.J.H, Venkatesan, T, Wang, S.J, Ariando, NUSNNI-Nanocore, National University of Singapore117411, Singapore, Department of Physics, National University of Singapore117542, Singapore (2015). Temperature dependence of photoluminescence spectra of bilayer two-dimensional electron gases in LaAlO3/SrTiO3 superlattices: Coexistence of Auger recombination and single-carrier trapping. AIP Advances 5 (6) : 67163. ScholarBank@NUS Repository. https://doi.org/10.1063/1.4923320
Abstract: We report emerging photoluminescence (PL) of bilayer two-dimensional electron gases (2DEG) in LaAlO3/SrTiO3 (LAO/STO) systems. A strong blue PL emerges in bilayer-2DEGs in LAO/STO/LAO/STO which doesn't show in LAO/STO. PL band in bilayer-2DEGs includes both nearly temperature independent Auger recombination and temperature dependent free electron trapping while it crossovers from Auger recombination to single carrier trapping in LAO/STO. The PL signal of free electron trapping appears at high temperatures and it is much stronger than Auger recombination in the conducting channel in bilayer 2DEGs. This observation shows that high mobility carriers dominate the carrier dynamics in bilayer-2DEGs in LAO/STO superlattices. © 2015 Author(s).
Source Title: AIP Advances
URI: https://scholarbank.nus.edu.sg/handle/10635/176147
ISSN: 2158-3226
DOI: 10.1063/1.4923320
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