Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO_{3}/SrTiO_{3} Interface.

Autor: Xu P; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA., Ayino Y; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA., Cheng C; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA., Pribiag VS; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA., Comes RB; Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA., Sushko PV; Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA., Chambers SA; Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA., Jalan B; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2016 Sep 02; Vol. 117 (10), pp. 106803. Date of Electronic Publication: 2016 Sep 01.
DOI: 10.1103/PhysRevLett.117.106803
Abstrakt: Through systematic control of the Nd concentration, we show that the carrier density of the two-dimensional electron gas (2DEG) in SrTiO_{3}/NdTiO_{3}/SrTiO_{3}(001) can be modulated over a wide range. We also demonstrate that the NdTiO_{3} in heterojunctions without a SrTiO_{3} cap is degraded by oxygen absorption from air, resulting in the immobilization of donor electrons that could otherwise contribute to the 2DEG. This system is, thus, an ideal model to understand and control the insulator-to-metal transition in a 2DEG based on both environmental conditions and film-growth processing parameters.
Databáze: MEDLINE
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