Does a pristine, unreconstructed SrTiO$_3$(001) surface exist?

Photoemission study on pristine and Ni-doped SrTiO$_{3}$ thin films

We combined photoelemission spectroscopy with first-principle calculations to investigate structural and electronic properties of SrTiO$_{3}$ doped with Ni impurities. In SrTiO$_{3}$ polycrystalline thin films, grown by magnetron sputtering, the mean size of the crystallites increases with the concentration of Ni. To determine the electronic band structure of SrTiO$_{3}$ films doped with Ni, high quality ordered pristine and SrTiO3:Ni$_{x}$ films with x=0.06 and 0.12 were prepared by pulsed laser deposition. Electronic band structure calculations for the ground state, as well as one-step model…

Ionic liquid gating of SrTiO$_3$ lamellas fabricated with a focused ion beam

In this work, we combine two previously-incompatible techniques for defining electronic devices: shaping three-dimensional crystals by focused ion beam (FIB), and two-dimensional electrostatic accumulation of charge carriers. The principal challenge for this integration is nanometer-scale surface damage inherent to any FIB-based fabrication. We address this by using a sacrificial protective layer to preserve a selected pristine surface. The test case presented here is accumulation of 2D carriers by ionic liquid gating at the surface of a micron-scale SrTiO$_3$ lamella. Preservation of surface …

位错密度对氧化物摩擦学响应的影响：以SrTiO3为例

Influence of dislocation density on the tribological response in oxides: case study on SrTiO3

本研究以SrTiO3为对象，探究了预制位错密度对氧化物微划痕响应的影响，发现位错可抑制弹性变形、改变裂纹形态，为位错调控近表面损伤容限提供了直接证据。

基于神经网络势的SrTiO$_3$中氧空位扩散的理论研究

Theoretical Investigation of Oxygen-Vacancy Diffusion in SrTiO$_3$ using Neural Network Potentials

本研究开发适用于SrTiO$_3$的神经网络势，通过大规模分子动力学模拟研究氧空位扩散，所得扩散系数与实验数据吻合度高，迁移焓接近实验值，为钙钛矿氧化物缺陷研究提供高效框架。

原始笼目金属CsV$_3$Sb$_5$中的大费米面及增强的准粒子有效质量

Large Fermi surface in pristine kagome metal CsV$_3$Sb$_5$ and enhanced quasiparticle effective masses

本研究通过高压下的舒布尼科夫-德哈斯量子振荡测量，绘制了CDW序被完全抑制的原始态CsV$_3$Sb$_5$的大费米面，发现准粒子有效质量在临界压力附近有微弱增强，为理解该金属母体态提供了关键依据。

Epitaxial growth and scanning tunneling microscopy of LiV$_2$O$_4$ thin films on SrTiO$_3$(111)

LiV$_2$O$_4$ is a mixed-valent spinel oxide and one of a few transition-metal compounds to host a heavy fermion phase at low temperatures. While numerous experimental studies have attempted to elucidate how its 3$d$ electrons undergo giant mass renormalization, spectroscopic probes that may provide crucial hints, such as scanning tunneling microscopy (STM), remain to be applied. A prerequisite is atomically flat and pristine surfaces, which, in the case of LiV$_2$O$_4$, are difficult to obtain by cleavage of small, three-dimensional crystals. We report the epitaxial growth of LiV$_2$O$_4$ thin…