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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 2termination, 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:
 [1];  [2];  [3];  [4];  [4];  [5];  [3]
  1. Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  2. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  5. Stanford Univ., CA (United States). Dept. of Applied Physics and Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
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). Materials Sciences & Engineering Division
OSTI Identifier:
1545528
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
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 ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
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 SrTiO3 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 SrTiO3 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 SrTiO3 surface terminations". United States. doi:10.1073/pnas.1821937116.
@article{osti_1545528,
title = {Dichotomy of the photo-induced 2-dimensional electron gas on SrTiO3 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 SrTiO3(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 TiO2termination, contrary to expectation. This dichotomy of the observed angle-resolved photoemission spectroscopy (ARPES) spectra is similarly seen in BaTiO3(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 = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}

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Works referenced in this record:

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