Physics Department - Anyon Superconductivity
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Abstract
Unconventional superconductivity beyond phonon-mediated pairing has long been a central theme in condensed matter physics, and in the late 1980s Laughlin proposed the striking idea of "anyon superconductivity," which stalled because anyons were never identified in cuprates. In this talk I describe how moiré materials revive this mechanism: their fractional Chern insulator (FCI) states host anyonic excitations, and superconductivity is repeatedly observed in close proximity. Using large-scale numerics in the lowest Landau level with a periodic potential, we show that purely repulsive interactions can produce a spinless chiral f-wave superconductor and reveal a continuous transition from an FCI to a superconductor, strongly pointing to an anyon-driven route rather than conventional pairing. We then formulate modern critical field theories (QED3–Chern–Simons and QCD3–Chern–Simons) that place Laughlin's proposal in contemporary language and provide a controlled framework for a strongly correlated pathway to superconductivity.
Taige Wang is a theoretical condensed matter physicist and currently an HQI Prize Postdoctoral Fellow at Harvard University and a joint postdoctoral fellow at MIT. He received his PhD in Physics from UC Berkeley under the supervision of Michael P. Zaletel. His research focuses on strongly correlated 2D and moiré materials, fractional quantum Hall physics, unconventional superconductivity, and quantum criticality, combining microscopic modeling, field theory, and large-scale numerical simulations in close contact with experiments.