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• W4383499392 abstract "Long-lived photoinduced conductance changes in LaAlO3/SrTiO3 (LAO/STO) heterostructures enable their use in optoelectronic memory applications. However, it remains challenging to quench the persistent photoconductivity (PPC) instantly and reproducibly, which limits the reversible optoelectronic switching. Herein, we demonstrate a reversible photomodulation of two-dimensional electron gas (2DEG) in LAO/STO heterostructures with high reproducibility. By irradiating UV pulses, the 2DEG at the LAO/STO interface is gradually transformed to the PPC state. Notably, the PPC can be completely removed by water treatment when two key requirements are met: (1) the moderate oxygen deficiency in STO and (2) the minimal band edge fluctuation at the interface. Through our X-ray photoelectron spectroscopy and electrical noise analysis, we reveal that the reproducible change in the conductivity of 2DEG is directly attributed to the surface-driven electron relaxation in the STO. Our results provide a stepping-stone toward developing optically tunable memristive devices based on oxide 2DEG systems." @default.
• W4383499392 created "2023-07-08" @default.
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• W4383499392 date "2023-07-07" @default.
• W4383499392 modified "2023-10-18" @default.
• W4383499392 title "Reversible Photomodulation of Two-Dimensional Electron Gas in LaAlO₃/SrTiO₃ Heterostructures" @default.
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• W4383499392 doi "https://doi.org/10.1021/acs.nanolett.3c01076" @default.
• W4383499392 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37418557" @default.
• W4383499392 hasPublicationYear "2023" @default.
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