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Title: A termination-insensitive and robust electron gas at the heterointerface of two complex oxides

Abstract

The single-crystal SrTiO3 (001) has two different surface terminations, TiO2 and SrO. One most remarkable observation in previous studies is that only the heterointerfaces with TiO2-terminated SrTiO3, which usually combines with polar oxides such as LaAlO3, host an electron gas. Here we show that a robust electron gas can be generated between a non-polar oxide, CaHfO3, and SrTiO3 (001) with either termination. Unlike the well-known electron gas of LaAlO3/SrTiO3, the present one of CaHfO3/SrTiO3 essentially has no critical thickness of CaHfO3, can survive a long-time oxygen annealing at high temperature, and its transport properties are stable under exposure to water and other polar solvents. By electrostatic gating through CaHfO3, field-effect devices are demonstrated using CaHfO3/SrTiO3 heterointerfaces with both terminations. These results show that the electron gas reported in the present study is unique and promising for applications in oxide electronics.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [3]
  1. Zhejiang Univ., Hangzhou (China)
  2. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Zhejiang Univ., Hangzhou (China); Nanjing Univ. (China)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Ministry of Science and Technology of China (MOST)
OSTI Identifier:
1597947
Grant/Contract Number:  
AC02-76SF00515; 2016YFA0300204; 2017YFA0303002
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Condensed-matter physics; Electronic devices; Electronics, photonics and device physics; Materials science

Citation Formats

Zhang, Meng, Du, Kai, Ren, Tianshuang, Tian, He, Zhang, Ze, Hwang, Harold Y., and Xie, Yanwu. A termination-insensitive and robust electron gas at the heterointerface of two complex oxides. United States: N. p., 2019. Web. https://doi.org/10.1038/s41467-019-12036-5.
Zhang, Meng, Du, Kai, Ren, Tianshuang, Tian, He, Zhang, Ze, Hwang, Harold Y., & Xie, Yanwu. A termination-insensitive and robust electron gas at the heterointerface of two complex oxides. United States. https://doi.org/10.1038/s41467-019-12036-5
Zhang, Meng, Du, Kai, Ren, Tianshuang, Tian, He, Zhang, Ze, Hwang, Harold Y., and Xie, Yanwu. Fri . "A termination-insensitive and robust electron gas at the heterointerface of two complex oxides". United States. https://doi.org/10.1038/s41467-019-12036-5. https://www.osti.gov/servlets/purl/1597947.
@article{osti_1597947,
title = {A termination-insensitive and robust electron gas at the heterointerface of two complex oxides},
author = {Zhang, Meng and Du, Kai and Ren, Tianshuang and Tian, He and Zhang, Ze and Hwang, Harold Y. and Xie, Yanwu},
abstractNote = {The single-crystal SrTiO3 (001) has two different surface terminations, TiO2 and SrO. One most remarkable observation in previous studies is that only the heterointerfaces with TiO2-terminated SrTiO3, which usually combines with polar oxides such as LaAlO3, host an electron gas. Here we show that a robust electron gas can be generated between a non-polar oxide, CaHfO3, and SrTiO3 (001) with either termination. Unlike the well-known electron gas of LaAlO3/SrTiO3, the present one of CaHfO3/SrTiO3 essentially has no critical thickness of CaHfO3, can survive a long-time oxygen annealing at high temperature, and its transport properties are stable under exposure to water and other polar solvents. By electrostatic gating through CaHfO3, field-effect devices are demonstrated using CaHfO3/SrTiO3 heterointerfaces with both terminations. These results show that the electron gas reported in the present study is unique and promising for applications in oxide electronics.},
doi = {10.1038/s41467-019-12036-5},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {9}
}

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    Works referencing / citing this record:

    LaScO 3 /SrTiO 3 : A conducting polar heterointerface of two 3d band insulating perovskites
    journal, February 2020

    • Kumar, Sumit; Kaswan, Jyoti; Satpati, Biswarup
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