Author:
Jaiban P.,Lu M.-H.,Eknapakul T.,Chaiyachad S.,Yao S. H.,Pisitpipathsin N.,Unruan M.,Siriroj S.,He R.-H.,Mo S.-K.,Watcharapasorn A.,Yimnirun R.,Tokura Y.,Shen Z.-X.,Hwang H. Y.,Maensiri S.,Meevasana W.
Abstract
AbstractThe discovery of a two-dimensional electron gas (2DEG) at the $$\hbox {LaAlO}_3/\hbox {SrTiO}_3$$
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 $$\hbox {KTaO}_3$$
KTaO
3
, $$\hbox {BaTiO}_3$$
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.
Funder
Office of the Higher Education Commission and Suranaree University of Technology
National Natural Science Foundation of China
Zhejiang Provincial Natural Science Foundation of China
Office of Basic Energy Science of the US DOE
Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
Publisher
Springer Science and Business Media LLC
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