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Xu P, Ayino Y, Cheng C, et al. Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO_{3}/SrTiO_{3} Interface. Phys Rev Lett. 2016;117(10):106803doi: 10.1103/PhysRevLett.117.106803.
Xu, P., Ayino, Y., Cheng, C., Pribiag, V. S., Comes, R. B., Sushko, P. V., Chambers, S. A., & Jalan, B. (2016). Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO_{3}/SrTiO_{3} Interface. Physical review letters, 117(10), 106803. https://doi.org/10.1103/PhysRevLett.117.106803
Xu, Peng, et al. "Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO_{3}/SrTiO_{3} Interface." Physical review letters vol. 117,10 (2016): 106803. doi: https://doi.org/10.1103/PhysRevLett.117.106803
Xu P, Ayino Y, Cheng C, Pribiag VS, Comes RB, Sushko PV, Chambers SA, Jalan B. Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO_{3}/SrTiO_{3} Interface. Phys Rev Lett. 2016 Sep 02;117(10):106803. doi: 10.1103/PhysRevLett.117.106803. Epub 2016 Sep 01. PMID: 27636487.
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Phys Rev Lett. 2016 Sep 02;117(10):106803. doi: 10.1103/PhysRevLett.117.106803. Epub 2016 Sep 01.

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

Physical review letters

Peng Xu, Yilikal Ayino, Christopher Cheng, Vlad S Pribiag, Ryan B Comes, Peter V Sushko, Scott A Chambers, Bharat Jalan

Affiliations

  1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  2. School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  3. Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.

PMID: 27636487 DOI: 10.1103/PhysRevLett.117.106803

Abstract

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.

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