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SYWS: Symposium Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems

SYWS 1: Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems

SYWS 1.3: Hauptvortrag

Donnerstag, 11. September 2025, 11:45–12:15, ZHG008

Fractional Quantum Anomalous Hall Effect and Chiral Superconductivity in Graphene — •Long Ju — MIT, Cambridge, Massachusetts, USA

Condensed matter physics has witnessed emergent quantum phenomena driven by electron correlation and topology. Two prominent examples are Fractional Quantum Hall Effect and Superconductivity. In this talk, I will show how these two disparate phenomena can be unified in the simplest carbon material: a crystalline stacking order of graphene called rhombohedral stacking. Not only it can exhibit both fractional and superconducting electron physics, we observed both with a twist: the FQHE happens at zero magnetic field, therefore Fractional Quantum Anomalous Hall Effect; the superconductor is a magnet by itself, therefore Chiral Superconductor. I will discuss the origin of these states and their implications for fundatmental physics studies and topological quantum computation.

Keywords: Fractional Quantum Anomalous Hall Effect; Chiral Superconductivity; Rhombohedral Graphene; 2D Materials; Moire Superlattice