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From Fractionalization to Chiral Topological Superconductivity in a Flat Chern Band
Daniele Guerci1, Ahmed Abouelkomsan1, Liang Fu1
1Massachusetts Institute of Technology, Department of Physics, Cambridge, Massachusetts-02139, USA.
Physical Review Letters
|November 17, 2025
Summary
Interacting electrons in flat Chern bands can form a chiral f-wave topological superconductor with neutral Majorana fermion edge modes. This superconductivity arises from an interaction-induced metallic state showing an anomalous Hall effect.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
Background:
- Flat Chern bands are crucial for observing topological phenomena.
- Fractional Chern insulators exhibit exotic electronic states.
- Topological superconductors host unique quasiparticle excitations.
Purpose of the Study:
- To investigate the emergent electronic phases in flat Chern bands.
- To identify novel topological superconducting states.
- To explore the role of electron-electron interactions.
Main Methods:
- Theoretical modeling of interacting electrons in flat Chern bands.
- Analysis of emergent superconducting states and their topological properties.
- Investigation of edge mode characteristics.
Main Results:
- A chiral f-wave topological superconductor is predicted to form.
- Neutral Majorana fermion edge modes are hosted by this superconductor.
- Superconductivity originates from an interaction-induced metallic state with anomalous Hall effect.
Conclusions:
- Interacting electrons in flat Chern bands support rich topological phases beyond fractional Chern insulators.
- The discovered topological superconductor offers a new platform for studying Majorana fermions.
- Experimental signatures may be found in systems like rhombohedral graphene and twisted transition metal dichalcogenides.
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