The electron band structure of graphene on SrTiO₃ substrate has been investigated as a function of temperature. The high-resolution angle-resolved photoemission study reveals that the spectral width at Fermi energy and the Fermi velocity of graphene on SrTiO₃ are comparable to those of graphene on a BN substrate. Near the charge neutrality, the energy-momentum dispersion of graphene exhibits a strong deviation from the well-known linearity, which is magnified as temperature decreases. Such modification resembles the characteristics of enhanced electron–electron interaction. Our results not only suggest that SrTiO₃ can be a plausible candidate as a substrate material for applications in graphene-based electronics but also provide a possible route toward the realization of a new type of strongly correlated electron phases in the prototypical two-dimensional system via the manipulation of temperature and a proper choice of dielectric substrates.

中文翻译：

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石墨烯在SrTiO ₃上的温度依赖性电子-电子相互作用

研究了SrTiO ₃衬底上石墨烯的电子能带结构随温度的变化。高分辨率角度分辨光发射研究表明，在SrTiO ₃上，石墨烯在费米能量处的光谱宽度和费米速度与BN基片上的石墨烯相当。接近电荷中性时，石墨烯的能量动量色散表现出与众所周知的线性的强烈偏差，线性随温度降低而放大。这种修饰类似于增强的电子-电子相互作用的特征。我们的结果不仅表明SrTiO ₃ 可以是一个合理的候选作为用于基于石墨烯的电子应用的基板材料，而且通过温度的操作和适当选择提供朝向实现在原型二维系统中的新类型强烈相关电子相的一个可能的路径介电基板。