Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface

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

doi:10.1103/PhysRevLett.117.106803

Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface

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

Research output: Contribution to journal › Article › peer-review

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Abstract

Through systematic control of the Nd concentration, we show that the carrier density of the two-dimensional electron gas (2DEG) in SrTiO3/NdTiO3/SrTiO3(001) 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.

Original language	English (US)
Article number	106803
Journal	Physical review letters
Volume	117
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.117.106803
State	Published - Sep 1 2016

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abstract = "Through systematic control of the Nd concentration, we show that the carrier density of the two-dimensional electron gas (2DEG) in SrTiO3/NdTiO3/SrTiO3(001) 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.",

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AU - Xu, Peng

AU - Ayino, Yilikal

AU - Cheng, Christopher

AU - Pribiag, Vlad S.

AU - Comes, Ryan B.

AU - Sushko, Peter V.

AU - Chambers, Scott A.

AU - Jalan, Bharat

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AB - Through systematic control of the Nd concentration, we show that the carrier density of the two-dimensional electron gas (2DEG) in SrTiO3/NdTiO3/SrTiO3(001) 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.

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Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface

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