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 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.
- Authors:
-
- Department of Applied Physics, Stanford University, Stanford, CA 94305,, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025,
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025,, Department of Physics, Stanford University, Stanford, CA 94305,
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025,
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025
- Department of Applied Physics, Stanford University, Stanford, CA 94305,, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025,, Department of Physics, Stanford University, Stanford, CA 94305,
- 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); 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. https://doi.org/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. https://doi.org/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 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 = 34,
volume = 116,
place = {United States},
year = {2019},
month = {8}
}
https://doi.org/10.1073/pnas.1821937116
Figures / Tables:

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