Closed-cycle low-temperature probestation with magnetic (vector) field

近年来，人们发现，除了传统的半导体，新开发的材料作为电子元件具有有趣的特性。除了基于过渡金属硫属化物的二维晶体之外，拓扑绝缘体和其他表面定义的纳米结构显示了固态物理和电输运的全新方面。目前，这些都是难以生产足够的质量和结构。它们作为胶体纳米材料的合成是非常有前途的，因为这种方法提供了多种精确的可能性来影响它们的结构特性。在所要求的探针台的帮助下，这种扩展的一维和二维胶体纳米结构的光电特性将被研究。特别地，电传输机制可以被识别和表征为温度和磁场的函数。由于所涉及的能量差和带隙相当小，并且在某些情况下结构也具有超导性质，因此相应的低温是必要的。为了完整表征传输过程，还需要表征对磁场的依赖性，这就是为什么需要具有内置探头的低温恒温器，温度低于2 K，磁场高达9 T。

In recent years it has been found that, beyond traditional semiconductors, newly developed materials have interesting properties as electronic components. In addition to two-dimensional crystals based on transition metal chalcogenides, topological insulators and other surface-defined nanostructures show completely new aspects of solid-state physics and electrical transport. At the moment, these are difficult to produce with sufficient quality and structure. Their synthesis as colloidal nanomaterials is very promising, since this method offers a multitude of precise possibilities for influencing their structural properties. With the help of the requested probe station, the optoelectronic properties of such extended one- and two-dimensional colloidal nanostructures will to be investigated. In particular, the electrical transport mechanisms can be identified and characterized as a function of temperature and magnetic field. Since the energy differences and band gaps involved are quite small and the structures also have superconducting properties in some cases, corresponding low temperatures are necessary. For a complete characterization of transport processes the dependency on magnetic fields need to be characterized as well, which is why a cryostat with a built-in probestation for temperatures below 2 K and magnetic fields up to 9 T is requested.