Electric field control of superconductivity and quantized anomalous Hall effects in rhombohedral tetralayer graphene: Part 2

Inducing superconducting correlations in chiral edge states is predicted to generate topologically protected modes with exotic quantum statistics. Past experimental efforts have focused on engineering interfaces between superconducting materials and quantum Hall systems. Here, we present rhombohedral tetralayer graphene as an ideal platform for these hybrid interfaces leveraging the gate-tuned ground states between intrinsic superconductors and quantum anomalous Hall states.

In the second of two talks, we present thermodynamic compressibility measurements and extraction of the thermodynamic gap in topologically ordered fractional and integer Chern insulators at zero magnetic field. We further show that integrating an additional transition metal dichalcogenide layer to the heterostructure nucleates a new superconducting pocket, while the topology of the ν =-1 quantum anomalous Hall state remains intact. Finally, we discuss a superconducting pocket at ν =-2 on the strong moiré side, which shows strong violation of the Pauli limit consistent with spin-polarized superconductivity.