论文标题
在SRTIO3和基于SRTIO3的异质结构中，大型极性作为键粒子
Large polarons as key quasiparticles in SrTiO3 and SrTiO3-based heterostructures
论文作者
论文摘要
尽管其简单的结构和低度的电子相关性，但SRTIO $ _3 $（STO）的集体现象与充电运输有关，最终尚未完全解释过超导性。因此，需要更好地洞察塑造STO电子和传导特性的准粒子性质。我们研究了散装STO的低能激励和Laalo $ _ {3} $/srtio $ _ {3} $ ti l $ _3 $ _3 $ edge Edge resonant resonant无弹性X射线散射。在所有样品中，我们以强烈的$ DD $+声子激发的形式找到了极性的标志，并且在从绝缘到高度导电的STO单晶和异质结构时，LO3模式电子偶联的降低。这两个结果都归因于大极化自我诱导的极化的动态筛选，这表明基于Sto和Sto的2DEG的低温物理是由大型偏极准粒子主导的。
Despite its simple structure and low degree of electronic correlation, SrTiO$_3$ (STO) features collective phenomena linked to charge transport and, ultimately, superconductivity, that are not yet fully explained. Thus, a better insight in the nature of the quasiparticles shaping the electronic and conduction properties of STO is needed. We studied the low energy excitations of bulk STO and of the LaAlO$_{3}$/SrTiO$_{3}$ two dimensional electron gas (2DEG) by Ti L$_3$ edge resonant inelastic x-ray scattering. In all samples, we find the hallmark of polarons in the form of intense $dd$+phonon excitations, and a decrease of the LO3-mode electron-phonon coupling when going from insulating to highly conducting STO single crystals and heterostructures. Both results are attributed to the dynamic screening of the large polaron self-induced polarization, showing that the low temperature physics of STO and STO-based 2DEGs is dominated by large polaron quasiparticles.
