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Title: Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition

Abstract

The discovery of a two-dimensional electron gas (2DEG) at the $$$$\hbox {LaAlO}_3/\hbox {SrTiO}_3$$$$ LaAlO 3 / SrTiO 3 interface has set a new platform for all-oxide electronics which could potentially exhibit the interplay among charge, spin, orbital, superconductivity, ferromagnetism and ferroelectricity. In this work, by using angle-resolved photoemission spectroscopy and conductivity measurement, we found the reduction of 2DEGs and the changes of the conductivity nature of some ferroelectric oxides including insulating Nb-lightly-substituted $$$$\hbox {KTaO}_3$$$$ KTaO 3 , $$$$\hbox {BaTiO}_3$$$$ BaTiO 3 (BTO) and (Ca,Zr)-doped BTO across paraelectric-ferroelectric transition. We propose that these behaviours could be due to the increase of space-charge screening potential at the 2DEG/ferroelectric regions which is a result of the realignment of ferroelectric polarisation upon light irradiation. This finding suggests an opportunity for controlling the 2DEG at a bare oxide surface (instead of interfacial system) by using both light and ferroelectricity.

Authors:
 [1];  [2];  [3];  [3];  [2];  [4];  [4];  [3];  [5];  [6];  [7];  [8];  [9];  [10];  [10];  [3];  [11]
+ Show Author Affiliations
  1. Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand); King Mongkut's Inst. of Technology North Bangkok, Rayong (Thailand)
  2. Nanjing Univ. (China)
  3. Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand)
  4. Rajamangala Univ. of Technology Isan, Nakhon Ratchasima (Thailand)
  5. Westlake Univ., Hangzhou (China)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. Chiang Mai Univ. (Thailand)
  8. Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand); Vidyasirimedhi Inst. of Science and Technology (VISTEC), Rayong (Thailand)
  9. Univ. of Tokyo (Japan)
  10. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  11. Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand); Thailand Center of Excellence in Physics (ThEP), MHESI, Bangkok (Thailand)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Zhejiang Provincial Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1764530
Alternate Identifier(s):
OSTI ID: 1779813
Grant/Contract Number:  
AC02-05CH11231; AC02-76SF00515; 11874053; LZ19A040001
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; ferroelectrics and multiferroics; phase transitions and critical phenomena

Citation Formats

Jaiban, P., Lu, M.-H., Eknapakul, T., Chaiyachad, S., Yao, S. H., Pisitpipathsin, N., Unruan, M., Siriroj, S., He, R.-H., Mo, S.-K., Watcharapasorn, A., Yimnirun, R., Tokura, Y., Shen, Z.-X., Hwang, H. Y., Maensiri, S., and Meevasana, W. Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition. United States: N. p., 2020. Web. doi:10.1038/s41598-020-73657-1.
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Jaiban, P., Lu, M.-H., Eknapakul, T., Chaiyachad, S., Yao, S. H., Pisitpipathsin, N., Unruan, M., Siriroj, S., He, R.-H., Mo, S.-K., Watcharapasorn, A., Yimnirun, R., Tokura, Y., Shen, Z.-X., Hwang, H. Y., Maensiri, S., & Meevasana, W. Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition. United States. https://doi.org/10.1038/s41598-020-73657-1
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Jaiban, P., Lu, M.-H., Eknapakul, T., Chaiyachad, S., Yao, S. H., Pisitpipathsin, N., Unruan, M., Siriroj, S., He, R.-H., Mo, S.-K., Watcharapasorn, A., Yimnirun, R., Tokura, Y., Shen, Z.-X., Hwang, H. Y., Maensiri, S., and Meevasana, W. Thu . "Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition". United States. https://doi.org/10.1038/s41598-020-73657-1. https://www.osti.gov/servlets/purl/1764530.
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@article{osti_1764530,
title = {Spectral weight reduction of two-dimensional electron gases at oxide surfaces across the ferroelectric transition},
author = {Jaiban, P. and Lu, M.-H. and Eknapakul, T. and Chaiyachad, S. and Yao, S. H. and Pisitpipathsin, N. and Unruan, M. and Siriroj, S. and He, R.-H. and Mo, S.-K. and Watcharapasorn, A. and Yimnirun, R. and Tokura, Y. and Shen, Z.-X. and Hwang, H. Y. and Maensiri, S. and Meevasana, W.},
abstractNote = {The discovery of a two-dimensional electron gas (2DEG) at the $$\hbox {LaAlO}_3/\hbox {SrTiO}_3$$ LaAlO 3 / SrTiO 3 interface has set a new platform for all-oxide electronics which could potentially exhibit the interplay among charge, spin, orbital, superconductivity, ferromagnetism and ferroelectricity. In this work, by using angle-resolved photoemission spectroscopy and conductivity measurement, we found the reduction of 2DEGs and the changes of the conductivity nature of some ferroelectric oxides including insulating Nb-lightly-substituted $$\hbox {KTaO}_3$$ KTaO 3 , $$\hbox {BaTiO}_3$$ BaTiO 3 (BTO) and (Ca,Zr)-doped BTO across paraelectric-ferroelectric transition. We propose that these behaviours could be due to the increase of space-charge screening potential at the 2DEG/ferroelectric regions which is a result of the realignment of ferroelectric polarisation upon light irradiation. This finding suggests an opportunity for controlling the 2DEG at a bare oxide surface (instead of interfacial system) by using both light and ferroelectricity.},
doi = {10.1038/s41598-020-73657-1},
journal = {Scientific Reports},
number = 1,
volume = 10,
place = {United States},
year = {Thu Oct 08 00:00:00 EDT 2020},
month = {Thu Oct 08 00:00:00 EDT 2020}
}
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https://doi.org/10.1038/s41598-020-73657-1
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