期刊
ADVANCED SCIENCE
卷 8, 期 22, 页码 -出版社
WILEY
DOI: 10.1002/advs.202100602
关键词
2-dimensional electron gas; angle-resolved photoemission spectroscopy; density functional theory; strontium titanate
资金
- Swiss National Science Foundation (SNF) [PP00P2_144742, PP00P2_170591, 200021_182695]
- Pro-Reitoria de Pesquisa of Universidade Federal de Minas Gerais
- Swiss National Science Foundation (SNF) [PP00P2_170591, 200021_182695, PP00P2_144742] Funding Source: Swiss National Science Foundation (SNF)
This study investigates the evolution of the electronic structure of a 2-dimensional electron gas (2DEG) on SrTiO3 surfaces, showing a metal-insulator transition around 135 K caused by local structure relaxations. The research presents a new method of tuning the 2DEG via surface vicinality and explores how prospective devices will respond to temperature changes through experimental and theoretical comparisons.
The 2-dimensional electron gas (2DEG) found at the surface of SrTiO3 and related interfaces has attracted significant attention as a promising basis for oxide electronics. In order to utilize its full potential, the response of this 2DEG to structural changes and surface modification must be understood in detail. Here, a study of the detailed electronic structure evolution of the 2DEG as a function of sample temperature and surface step density is presented. By comparing the experimental results with ab initio calculations, it is shown that local structure relaxations cause a metal-insulator transition of the system around 135 K. This study presents a new and simple way of tuning the 2DEG via surface vicinality and identifies how the operation of prospective devices will respond to changes in temperature.
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