Structural properties of ferroelectric heterostructures using coherent bragg rod analysis

Lee, Kyeong Jun; Choi, Taeyang; Noh, Tae Won; Zhou, Hua; Chang, Seo Hyoung

doi:10.1016/j.cap.2020.01.015

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…We note that atomic-scale interaction between oxygen molecules and surface structures should occurs depending on gas pressure and surface reconstructions in a reversible manner [37,38] . Thus, further experimental and theoretical investigations are highly required by employing surface structure analysis tools, such as scanning tunneling microscopy or surface x-ray scattering [38,39] .…”

Section: Resultsmentioning

confidence: 99%

Enhanced tunability of two-dimensional electron gas on SrTiO3 through heterostructuring

Yoo

Moreschini

Bostwick

et al. 2020

Current Applied Physics

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Two-dimensional electron gases (2DEGs) on the SrTiO3 (STO) surface or in STO-based heterostructures have exhibited many intriguing phenomena, which are strongly dependent on the 2DEG-carrier density. We report that the tunability of the 2DEG-carrier density is significantly enhanced by adding a monolayer LaTiO3 (LTO) onto the STO. Ultraviolet (UV) irradiation induced maximum carrier density of the 2DEG in LTO/STO is increased by a factor of ~4 times, compared to that of the bare STO. By oxygen gas exposure, it becomes 10 times smaller than that of the bare STO. This enhanced tunability is attributed to the drastic surface property change of a polar LTO layer by UV irradiation and O2 exposure. This indicates that the 2DEG controllability in LTO/STO is more reliable than that on the bare STO driven by defects, such an oxygen vacancy.

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Section: Resultsmentioning

confidence: 99%

Enhanced tunability of two-dimensional electron gas on SrTiO3 through heterostructuring

Yoo

Moreschini

Bostwick

et al. 2020

Current Applied Physics

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“…S2], but it is still complicated by the presence of O atoms in both the film and the substrate, of which near-surface coherent Bragg rod analysis is further requested. 46 In conclusion, we performed in situ ARPES measurements on the LAO/STO heterostructure to elucidate the underlying mechanism for the CI formation. We demonstrated that the CI can be created by polarity-induced Vbi in the LAO layer of the as-grown samples or by UV-irradiation-generated OV on the LAO surface.…”

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confidence: 99%