Stanford Synchrotron Radiation Lightsource

Speaker: Quynh L. Nguyen, SLAC

Program Description

Two-dimensional (2D) systems carry fascinating properties that potentially open a new paradigm for electronic devices — with prospects for higher-density storage, energy-efficient transport, and faster processing speed — which directly benefit a new era of quantum materials and QIS research. However, despite the great potentials of 2D materials, the last two decades of research have yet to set a substantial footprint into industrial applications due to scalability, operational complexity, and demanding fabrication procedures for high quality quantum systems (QS). I will discuss how we address some of the persisting key challenges and developing new approaches for QIS using ultrafast laser and x-ray spectroscopy, scattering, and microscopy with structured vortex light. Specifically, I will focus on how we characterize strongly correlated systems and layered materials, so that we can control and tailor them for real-life applications by exploiting vortex light, table-top high-harmonic generation, synchrotron, and free electron laser facilities – particularly moving towards the LCLS-II era – in combination with time-of-flight momentum microscopy (ToF-MM). For example, using x-ray element-selective, spectra-imaging with ToF-MM (ToF-XPEEM) and synchrotron, we unraveled the atomic positions of vanadium and tungsten atoms and layer-dependent spectroscopic properties of p-type vanadium dopant within the 2D semiconductor WS2 at unprecedented 100 nm spatial resolution. With LCLS-II, we can push beyond on these current imaging capabilities combined with spectroscopic and lattice information.  I will also discuss how we bridge the state-of-the-art technology with the computational frontier to accelerate massive data processing and analyses to achieve higher sensitivity and high throughput scientific discoveries. These new findings can provide insights into quantum devices for QIS applications and address fundamental scientific questions that will inform theory and guide the synthesis process for the most suitable QS candidates.