报告题目：Scanning Quantum Microscopy for Emergent Phases of Matter
报 告 人：Dr. Ruoming Peng 彭若酩 (University of Stuttgart, Germany)
报告时间：2025年1月17日14：00
报告地点：物理楼W105
内容摘要：Visualization of the nanoscale magnetic response in condensed matter systems offers a powerful approach to unraveling the fundamental mechanisms of spin interactions. Two-dimensional (2D) materials, with their controlled and versatile properties, serve as ideal platforms for exploring exotic correlated and topological states. In the first phase of our study, we achieved a significant breakthrough in investigating twisted double bilayer CrI₃. Our findings reveal a softening of magnetic anisotropy and an indication of magnetic competition at small twisted angles. This competition leads to the emergence of spontaneous periodic skyrmion features with a unique period, distinct from the Moiré periodicity dictated by the twist angle. In the second phase of my research, I focus on 2D superconducting systems, particularly the dynamics of vortices in thin exfoliated 2H-NbSe₂. A key discovery includes the melting of vortex solids near the critical temperature, enabling vortex re-arrangement and resulting in unconventional magnetic noise across different cool-down cycles. These insights open new avenues for understanding and manipulating emergent quantum phenomena in low-dimensional systems.
报告人简介：Dr. Ruoming Peng obtained his Ph.D. degree in electrical engineering from the University of Washington in 2022. He worked with Prof. Mo Li and studied exciton physics in 2D nanophotonic devices. After graduation, Ruoming spent a short period as the Kananoff-Rice postdoc fellow at the University of Chicago and then moved to the 3rd Institute of Physics at the University of Stuttgart and Max Planck Institute for Solid State Research under the supervision of Prof. Joerg Wrachtrup. Ruoming has developed strong expertise in 2D optical spectroscopy and quantum sensing. He is currently managing the scanning probe subgroup at the 3rd Institute of Physics and working on scanning quantum microscopy for emergent condensed matter phenomena.
