Ultrafast low-temperature UHV near-field microscope

鲁伯特·胡伯的团队最近展示了具有亚周期时间分辨率的多太赫兹近场显微镜，这促使了超快科学的一系列新研究进展。然而，目前的概念仅限于观察环境空气中的样本。对于固体物理中的系统应用来说，在低温和超高真空(UHV)中研究样品是必不可少的。这里要求的显微镜系统将填补这一空白，并开启近场显微镜的新篇章：相变的时空观察有望为高温超导以及电荷和自旋密度波提供新的见解。此外，范德华结合的固体和拓扑绝缘体中的极化子将在时间和空间上进行研究，在强烈抑制阻尼的温度范围内。半导体量子点中单激子的动力学和内部结构以及钙钛矿太阳能电池晶界电荷分离的动力学是可以理解的。因此，新的文书对正在进行的研究活动中针对的科学问题具有直接的相关性。该显微镜还将用于最近接受的新研究大楼(Forschungsbau)“雷根斯堡超快纳米技术中心(RUN)”的关键试点实验。

The recent demonstration of multi-terahertz near-field microscopy with subcycle temporal resolution by Rupert Huber’s group prompted a flurry of new research developments in ultrafast science. Yet, the current concept is limited to the observation of samples in ambient air. For systematic applications in solid state physics it is indispensable to investigate samples also at low temperature and in ultrahigh vacuum (UHV). The microscopy system requested here will fill this gap and open a new chapter in near-field microscopy: The spatio-temporal observation of phase transitions promises novel insights into high-temperature superconductivity as well as charge- and spin-density waves. Furthermore, polaritons in van der Waals-bonded solids and on topological insulators will be studied in space and time, in a temperature regime where damping is strongly suppressed. The dynamics and internal structure of single excitons in semiconductor quantum dots and the dynamics of charge separation at grain boundaries of perovskite solar cells will be accessible. The new instrument is, thus, of immediate relevance for scientific questions targeted in the ongoing research initiatives. The microscope will also be used for key pilot experiments for the recently accepted new research building (Forschungsbau) "Regensburg Center for Ultrafast Nanoscopy (RUN)".