Through systematic control of the Nd concentration, we show that the carrier density of the twodimensional electron gas (2DEG) in SrTiO3=NdTiO3=SrTiO3
ð001Þ can be modulated over a wide range. We also demonstrate that the NdTiO3 in heterojunctions without a SrTiO3 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.
Revised: October 9, 2020 |
Published: September 2, 2016
Citation
Xu P., Y. Ayino, C.J. Cheng, V.S. Pribiag, R.B. Comes, P.V. Sushko, and S.A. Chambers, et al. 2016.Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface.Physical Review Letters 117, no. 10:106806-6.PNNL-SA-123678.doi:10.1103/PhysRevLett.117.106803