Electric-field-induced polar order and localizition of the confined electrons in LaAlO3/SrTiO3 heterostructures
2013
With ellipsometry, x-ray diffraction, and resistance
measurements we investigated the electric-field effect on the
confined electrons at the LaAlO3=SrTiO3 interface. We obtained
evidence that the localization of the electrons at negative
gate voltage is induced, or at least enhanced, by a polar phase
transition in SrTiO3 which strongly reduces the lattice
polarizability and the subsequent screening. In particular, we
show that the charge localization and the polar order of SrTiO3
both develop below similar to 50 K and exhibit similar,
unipolar hysteresis loops as a function of the gate voltage.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
14
Citations
NaN
KQI