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Title: Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition
Authors: P. Jaiban
M. H. Lu
T. Eknapakul
S. Chaiyachad
S. H. Yao
N. Pisitpipathsin
M. Unruan
S. Siriroj
R. H. He
S. K. Mo
A. Watcharapasorn
R. Yimnirun
Y. Tokura
Z. X. Shen
H. Y. Hwang
S. Maensiri
W. Meevasana
Keywords: Multidisciplinary
Issue Date: 1-Dec-2020
Abstract: © 2020, The Author(s). The discovery of a two-dimensional electron gas (2DEG) at the LaAlO 3/ SrTiO 3 interface has set a new platform for all-oxide electronics which could potentially exhibit the interplay among charge, spin, orbital, superconductivity, ferromagnetism and ferroelectricity. In this work, by using angle-resolved photoemission spectroscopy and conductivity measurement, we found the reduction of 2DEGs and the changes of the conductivity nature of some ferroelectric oxides including insulating Nb-lightly-substituted KTaO 3, BaTiO 3 (BTO) and (Ca,Zr)-doped BTO across paraelectric-ferroelectric transition. We propose that these behaviours could be due to the increase of space-charge screening potential at the 2DEG/ferroelectric regions which is a result of the realignment of ferroelectric polarisation upon light irradiation. This finding suggests an opportunity for controlling the 2DEG at a bare oxide surface (instead of interfacial system) by using both light and ferroelectricity.
ISSN: 20452322
Appears in Collections:CMUL: Journal Articles

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