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Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition.

  • Author(s): Jaiban, P;
  • Lu, M-H;
  • Eknapakul, T;
  • Chaiyachad, S;
  • Yao, SH;
  • Pisitpipathsin, N;
  • Unruan, M;
  • Siriroj, S;
  • He, R-H;
  • Mo, S-K;
  • Watcharapasorn, A;
  • Yimnirun, R;
  • Tokura, Y;
  • Shen, Z-X;
  • Hwang, HY;
  • Maensiri, S;
  • Meevasana, W
  • et al.
Abstract

The discovery of a two-dimensional electron gas (2DEG) at the [Formula: see text] 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 [Formula: see text], [Formula: see text] (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.

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