Journal
NATURE MATERIALS
Volume 10, Issue 2, Pages 114-118Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat2943
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Funding
- DOE's Office of Basic Energy Sciences [DE-AC02-76SF00515, DE-AC03-76SF00098]
- UK-EPSRC [EP/F006640/1]
- ERC [207901]
- The Thailand Research Fund
- Office of the Higher Education Commission
- Suranaree University of Technology
- Engineering and Physical Sciences Research Council [EP/F006640/1] Funding Source: researchfish
- European Research Council (ERC) [207901] Funding Source: European Research Council (ERC)
- EPSRC [EP/F006640/1] Funding Source: UKRI
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Many-body interactions in transition-metal oxides give rise to a wide range of functional properties, such as high-temperature superconductivity(1), colossal magnetoresistance(2) or multiferroicity(3). The seminal recent discovery of a two-dimensional electron gas (2DEG) at the interface of the insulating oxides LaAlO3 and SrTiO3 (ref. 4) represents an important milestone towards exploiting such properties in all-oxide devices(5). This conducting interface shows a number of appealing properties, including a high electron mobility(4,6), superconductivity(7) and large magnetoresistance(8), and can be patterned on the few-nanometre length scale. However, the microscopic origin of the interface 2DEG is poorly understood. Here, we show that a similar 2DEG, with an electron density as large as 8 x 10(13) cm(-2), can be formed at the bare SrTiO3 surface. Furthermore, we find that the 2DEG density can be controlled through exposure of the surface to intense ultraviolet light. Subsequent angle-resolved photoemission spectroscopy measurements reveal an unusual coexistence of a light quasiparticle mass and signatures of strong many-body interactions.
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