Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface

Details Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface

2010-10-05

arxiv.org/abs/1010.0763v2

Nature Mater. 10, 114-118 (2011)

Physics

Condensed Matter

Materials Science

14 pages, 4 figures, supplementary information (see other files)

Scientific paper

10.1038/nmat2943

Many-body interactions in transition-metal oxides give rise to a wide range of functional properties, such as high-temperature superconductivity, colossal magnetoresistance, or multiferroicity. The seminal recent discovery of a two-dimensional electron gas (2DEG) at the interface of the insulating oxides LaAlO3 and SrTiO3 represents an important milestone towards exploiting such properties in all-oxide devices. This conducting interface shows a number of appealing properties, including a high electron mobility, superconductivity, and large magnetoresistance and can be patterned on the few-nanometer 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 8x10^13 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 (UV) light. Subsequent angle-resolved photoemission spectroscopy (ARPES) measurements reveal an unusual coexistence of a light quasiparticle mass and signatures of strong many-body interactions.

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