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|Title:||Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition|
M. H. Lu
S. H. Yao
R. H. He
S. K. Mo
Z. X. Shen
H. Y. Hwang
|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.|
|Appears in Collections:||CMUL: Journal Articles|
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