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Interaction between in-gap states and carriers at the conductive interface between perovskite oxides.

A new interesting article has been published in J Phys Condens Matter. 2018 Oct 10;30(40):405002. doi: 10.1088/1361-648X/aadd33. Epub 2018 Aug 28. and titled:

Interaction between in-gap states and carriers at the conductive interface between perovskite oxides.

Authors of this article are:
Li C1, Jiang W, Liu M, Hong Y, Xue H, Meng J, Zhang Z, Li Y, Liu K, He L, Dou R, Xiong C, Nie J.

A summary of the article is shown below:
The 2D electron systems of SrTiO3/NdGaO3 (STO/NGO) and amorphous-LaAlO3/SrTiO3/NdGaO3 (a-LAO/STO/NGO) heterojunctions were explored. An obvious interaction between in-gap states (IGSs) and carriers was found. The IGSs can trap a large number of carriers and enhance carrier scattering. As a result of the high density of IGSs in STO, the conductivity of STO/NGO was severely weakened. However, for a-LAO/STO/NGO heterojunctions, the high carrier density can reduce the effect of IGSs through the electrostatic screening effect. The competition between IGSs and the screening effect of carriers results in an insulator-metal transition and a strange temperature dependence of carrier density. We also explored the interaction between IGSs and carriers theoretically. A mathematical description was proposed and the calculated results showed good agreement with experimental findings.

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