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Title: Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO 3 / SrTiO 3 Interface

Abstract

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.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1345455
Report Number(s):
PNNL-SA-123678
Journal ID: ISSN 0031-9007; PRLTAO; 48341; KC0203020
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 117; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Environmental Molecular Sciences Laboratory

Citation Formats

Xu, Peng, Ayino, Yilikal, Cheng, Christopher, Pribiag, Vlad S., Comes, Ryan B., Sushko, Peter V., Chambers, Scott A., and Jalan, Bharat. Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.106803.
Xu, Peng, Ayino, Yilikal, Cheng, Christopher, Pribiag, Vlad S., Comes, Ryan B., Sushko, Peter V., Chambers, Scott A., & Jalan, Bharat. Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface. United States. doi:10.1103/PhysRevLett.117.106803.
Xu, Peng, Ayino, Yilikal, Cheng, Christopher, Pribiag, Vlad S., Comes, Ryan B., Sushko, Peter V., Chambers, Scott A., and Jalan, Bharat. Thu . "Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface". United States. doi:10.1103/PhysRevLett.117.106803.
@article{osti_1345455,
title = {Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO3/SrTiO3 Interface},
author = {Xu, Peng and Ayino, Yilikal and Cheng, Christopher and Pribiag, Vlad S. and Comes, Ryan B. and Sushko, Peter V. and Chambers, Scott A. and Jalan, Bharat},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.117.106803},
journal = {Physical Review Letters},
number = 10,
volume = 117,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}