Project Details
Two-dimensional quantum materials and nanostructures offer a unique platform for investigating emergent physics phenomena, characterized by distinct electronic, optical, and magnetic properties from their bulk counterparts. However, substantial gaps in our understanding persist in understanding properties that influenced by atomic and nanoscale effects, such as the dimensionality, defects, and spatial heterogeneity. Bridging these knowledge gaps necessitates cutting-edge techniques capable of intimately probing the fundamental lattice, charge, spin, and orbital degrees of freedom that collectively define the quantum state of matter, all at the relevant length scales and temperatures. Our overarching goal is to understand local spin–charge–lattice correlations and quasiparticle interactions in two-dimensional quantum materials and nanostructures. This proposed work will enable atomic-scale investigation and understanding of emergent properties by advancing Scanning Transmission Electron Microscopy (STEM) imaging and monochromated Electron Energy Loss Spectroscopy (EELS), combined with precise in situ cryogenic control and external stimuli. The project comprises three aims: Aim 1: Elucidate the effects of dimensionality and defects on the structure and magnetism of 2D magnets upon cryogenic phase transitions. Aim 2: Understand quasiparticle coupling and collective behavior in quantum nanostructures. Aim 3: Probe structure and spin dynamics using in situ STEM-EELS under integrated external stimuli. These aims synergistically combine to advance our understanding of 2D quantum materials and guide the development of new cryogenic microscopy and spectroscopy, addressing persistent physics challenges. The knowledge gained will facilitate novel materials design for advanced nanoelectronics and quantum technologies, aligning with the DOE's mission for a secure and sustainable energy future.
