Comparative Scanning Tunneling Microscopy Study on Hexaborides

Comparative study of rare earth hexaborides using high resolution angle-resolved photoemission

Strong electron correlations in rare earth hexaborides can give rise to a variety of interesting phenomena like ferromagnetism, Kondo hybridization, mixed valence, superconductivity and possibly topological characteristics. The theoretical prediction of topological properties in SmB$_{6}$ and YbB$_{6}$, has rekindled the scientific interest in the rare earth hexaborides, and high-resolution ARPES has been playing a major role in the debate. The electronic band structure of the hexaborides contains the key to understand the origin of the different phenomena observed, and much can be learned by …

A comparative investigation of thickness measurements of ultra-thin water films by scanning probe techniques

The reliable operation of micro and nanomechanical devices necessitates a thorough knowledge of the water film thickness present on the surfaces of these devices with an accuracy in the nm range. In this work, the thickness of an ultra-thin water layer was measured by distance tunnelling spectroscopy and distance dynamic force spectroscopy during desorption in an ultra-high vacuum system, from about 2.5 nm up to complete desorption at 1E-8 mbar. The tunnelling current as well as the amplitude of vibration and the normal force were detected as a function of the probe-sample distance. In these e…

Thermal decomposition and chemical vapor deposition: a comparative study of multi-layer growth of graphene on SiC(000-1)

This work presents a comparison of the structural, chemical and electronic properties of multi-layer graphene grown on SiC(000-1) by using two different growth approaches: thermal decomposition and chemical vapor deposition (CVD). The topography of the samples was investigated by using atomic force microscopy (AFM), and scanning electron microscopy (SEM) was performed to examine the sample on a large scale. Raman spectroscopy was used to assess the crystallinity and electronic behavior of the multi-layer graphene and to estimate its thickness in a non-invasive way. While the crystallinity of t…

Nanoscale magnetization and current imaging using scanning-probe magneto-thermal microscopy

Magnetic microscopy that combines nanoscale spatial resolution with picosecond scale temporal resolution uniquely enables direct observation of the spatiotemporal magnetic phenomena that are relevant to future high-speed, high-density magnetic storage and logic technologies. Magnetic microscopes that combine these metrics has been limited to facility-level instruments. To address this gap in lab-accessible spatiotemporal imaging, we develop a time-resolved near-field magnetic microscope based on magneto-thermal interactions. We demonstrate both magnetization and current density imaging modalit…

SiO2/Si衬底上碳纳米管阵列的低压扫描电子显微镜成像机制与衬度分离

Imaging mechanism and contrast separation in low-voltage scanning electron microscopy imaging of carbon nanotube arrays on SiO2/Si substrate

该研究揭示SiO2/Si上CNT阵列的LVSEM成像机制，提出通过工作距离或减速电压调控分离形貌、电荷和材料衬度的方法，显著降低表观直径并指出SEM密度低估问题。

调控half-Heusler体系拓扑特性的比较研究：Y$T$Bi（$T$ = Pd, Pt）

Tuning the topological character of half-Heusler systems: A comparative study on Y$T$Bi ($T$ = Pd, Pt)

本文通过扫描隧道显微镜/光谱学和密度泛函理论比较研究Y$T$Bi（$T$ = Pd, Pt），揭示自旋-轨道耦合增强是调控其表面态从平凡到拓扑非平凡的关键因素。