Flat-band superconductivity and quantum geometry
In a perfectly flat band electrons have no kinetic energy, so ordinary theory says they cannot carry a supercurrent, yet flat-band materials superconduct. The shape of the electron wavefunctions in momentum space (their quantum geometry) is thought to give the pairs the mobility they need.
Why it matters
It changes how superconducting transition temperatures are estimated and suggests designing bands for higher $T_{c}$.
Review
P. Torma, S. Peotta, B. A. Bernevig, Superfluidity and quantum geometry in twisted multilayer systems, Nature Reviews Physics, 2022. https://arxiv.org/abs/2111.00807 reference checked
See also
- Related Band-geometry criterion for fractional Chern insulator stability
- Related What binds electron pairs in magic-angle graphene superconductors?
Timestamp record
- Signed record
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- Public log
- Entry 134, in checkpoint 2,123
- In the log by
- Block 969,698, 2026-10-03
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