裸SrTiO3表面二维电子液体的产生和控制
Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
摘要：
过渡金属氧化物中的多体相互作用产生了广泛的功能特性，如高温超导性，巨磁阻或多铁性。最近在绝缘氧化物LaAlO 3和SrTiO 3的界面处发现了二维电子气（2DEG），这是在全氧化物器件中利用这些特性的一个重要里程碑。这种导电界面显示出许多吸引人的特性，包括高电子迁移率、超导性和大磁阻，并且可以在几纳米的长度尺度上图案化。然而，界面2DEG的微观起源知之甚少。在这里，我们发现在裸露的SrTiO 3表面也可以形成类似的二维电子气，其电子密度高达8 × 10^13 cm^-2。此外，我们发现，2DEG密度可以通过暴露于强烈的紫外线（UV）光的表面控制。随后的角分辨光电子能谱（ARPES）测量揭示了一个不寻常的共存轻准粒子质量和签名的强多体相互作用。
英文摘要：
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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