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Title: Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO 3 surface terminations

Abstract

Oxide materials are important candidates for the next generation of electronics due to a wide array of desired properties, which they can exhibit alone or when combined with other materials. While SrTiO 3 (STO) is often considered a prototypical oxide, it, too, hosts a wide array of unusual properties, including a 2-dimensional electron gas (2DEG), which can form at the surface when exposed to ultraviolet (UV) light. Using layer-by-layer growth of high-quality STO films, we show that the 2DEG only forms with the SrO termination and not with the TiO 2 termination, contrary to expectation. This dichotomy of the observed angle-resolved photoemission spectroscopy (ARPES) spectra is similarly seen in BaTiO 3 (BTO), in which the 2DEG is only observed for BaO-terminated films. These results will allow for a deeper understanding and better control of the electronic structure of titanate films, substrates, and heterostructures.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1564304
Alternate Identifier(s):
OSTI ID: 1545528
Grant/Contract Number:  
[AC02-76SF00515]
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
[Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 34]; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Rebec, Slavko N., Jia, Tao, Sohail, Hafiz M., Hashimoto, Makoto, Lu, Donghui, Shen, Zhi-Xun, and Moore, Robert G. Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO 3 surface terminations. United States: N. p., 2019. Web. doi:10.1073/pnas.1821937116.
Rebec, Slavko N., Jia, Tao, Sohail, Hafiz M., Hashimoto, Makoto, Lu, Donghui, Shen, Zhi-Xun, & Moore, Robert G. Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO 3 surface terminations. United States. doi:10.1073/pnas.1821937116.
Rebec, Slavko N., Jia, Tao, Sohail, Hafiz M., Hashimoto, Makoto, Lu, Donghui, Shen, Zhi-Xun, and Moore, Robert G. Wed . "Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO 3 surface terminations". United States. doi:10.1073/pnas.1821937116.
@article{osti_1564304,
title = {Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO 3 surface terminations},
author = {Rebec, Slavko N. and Jia, Tao and Sohail, Hafiz M. and Hashimoto, Makoto and Lu, Donghui and Shen, Zhi-Xun and Moore, Robert G.},
abstractNote = {Oxide materials are important candidates for the next generation of electronics due to a wide array of desired properties, which they can exhibit alone or when combined with other materials. While SrTiO 3 (STO) is often considered a prototypical oxide, it, too, hosts a wide array of unusual properties, including a 2-dimensional electron gas (2DEG), which can form at the surface when exposed to ultraviolet (UV) light. Using layer-by-layer growth of high-quality STO films, we show that the 2DEG only forms with the SrO termination and not with the TiO 2 termination, contrary to expectation. This dichotomy of the observed angle-resolved photoemission spectroscopy (ARPES) spectra is similarly seen in BaTiO 3 (BTO), in which the 2DEG is only observed for BaO-terminated films. These results will allow for a deeper understanding and better control of the electronic structure of titanate films, substrates, and heterostructures.},
doi = {10.1073/pnas.1821937116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = [34],
volume = [116],
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1821937116

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