Temperature dependence of photoluminescence spectra of bilayer two-dimensional electron gases in LaAlO3/SrTiO3 superlattices: coexistence of Auger recombination and single-carrier trapping

H. J. Harsan Ma; T. Venkatesan; S. J. Wang; Ariando

doi:10.1063/1.4923320

journal article·2015-06-01Open access

Temperature dependence of photoluminescence spectra of bilayer two-dimensional electron gases in LaAlO3/SrTiO3 superlattices: coexistence of Auger recombination and single-carrier trapping

H. J. Harsan Ma, T. Venkatesan, S. J. Wang, Ariando

AIP Advances· Volume 5· Issue 6

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Source abstract

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.

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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Semiconductor materials and devices · Magnetic and transport properties of perovskites and related materials

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Affiliations

National University of Singapore 1 NUSNNI-Nanocore, , 117411 Singapore

National University of Singapore 2 Department of Physics, , 117542 Singapore

National University of Singapore 3 Department of Electrical and Computer Engineering, , 117576 Singapore

Institute of Materials Research and Engineering (IMRE) 4 , A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602

Funding

National University of Singapore · National Research Foundation-Prime Minister's office, Republic of Singapore

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