Enhanced tunability of two-dimensional electron gas on SrTiO3 through heterostructuring
作者： Hyang Keun Yoo , Luca Moreschini , Aaron Bostwick , Andrew L. Walter , Tae Won Noh
DOI: 10.1016/J.CAP.2020.08.019
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摘要: Abstract Two-dimensional electron gases (2DEGs) on the SrTiO3 (STO) surface or in STO-based heterostructures have exhibited many intriguing phenomena, which are strongly dependent 2DEG-carrier density. We report that tunability of density is significantly enhanced by adding a monolayer LaTiO3 (LTO) onto STO. Ultraviolet (UV) irradiation induced maximum carrier 2DEG LTO/STO increased factor ~4 times, compared to bare By oxygen gas exposure, it becomes 10 times smaller than This attributed drastic property change polar LTO layer UV and O2 exposure. indicates controllability more reliable STO driven defects, such an vacancy.
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