Wednesday, January 29, 2025 4pm to 5pm
Imaging Emergence in 2D Materials
One of the most fascinating problems in modern physics is the connection between the microscopic physics of quantum objects, such as electrons, molecules or excitons, and macroscopic collective behavior, a concept known as emergence. Modern nanoscience has produced many powerful techniques for engineering quantum material properties into of two-dimensional (2D) materials. The resulting nanodevices are microns wide but only a few atoms thick; an all-surface geometry ideal for sophisticated imaging experiments. In this talk, I will introduce how quantum properties emerge from electronic interactions and how imaging mesoscale dynamics connects the microscopic world to the macroscopic world. To demonstrate this, I will discuss a nanoSQUID-on-Tip imaging experiment in rhombohedral graphene that reveals the collective ferromagnetism emerging from interactions of electrons in a flat band. Next, I will switch to a different 2D quantum system and use optoelectronic imaging to reveal the formation of an optoelectronic liquid from strongly interacting electron-hole pairs called optical excitons. I will conclude by drawing broad lessons from both approaches relevant to emergent physics in a diverse array of quantum systems.
Bio: Dr. Trevor Arp is currently a postdoc with Andrea Young at the University of California Santa Barbara, focusing on precise scanned probe measurements of rhombohedral graphene. He began his career in physics as an undergraduate at the University of Washington. He then went to the University of California Riverside working with Nathan Gabor and getting his PhD on optoelectronic imaging of excited electrons and holes in 2D materials. He is interested in the convergence of advanced instrumentation and nanoscience to reveal exotic electronic phases of matter.
Sciences Building (SCI), 1.210
800 W. Campbell Road, Richardson, Texas 75080-3021
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