期刊
PHYSICAL REVIEW LETTERS
卷 113, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.177601
关键词
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资金
- Swiss National Science Foundation [200021-146995]
- UK-EPSRC
- Royal Society
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [24224009]
- EPSRC [EP/I031014/1] Funding Source: UKRI
- Swiss National Science Foundation (SNF) [200021_146995] Funding Source: Swiss National Science Foundation (SNF)
- Engineering and Physical Sciences Research Council [EP/I031014/1] Funding Source: researchfish
We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.
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