In condensed matter systems with flat bands, the kinetic energy is suppressed and correlation effects dominate. But perhaps more interestingly, when the electronic interaction is projected onto the flat band, the shape of the wave function—the quantum geometry—crucially affects the fate of the resulting electronic state. In particular the form factor of the electron-electron interaction depends on how the wave function overlaps at different momenta. This form factor is directly related to the quantum metric and Berry curvature. This notion greatly impacts modern aspects of quantum many-body physics and quantum material research. This includes the novel phases discovered in magic angle twisted bilayer graphene, fractional quantum anomalous Hall (FQAH) insulators in Moiré materials, and the relation between these FQAH states and Landau level, as well as the projection of the latter in the realm of the fuzzy sphere approach to quantum criticality etc.

The aim of this workshop is to bring together a small group of researchers interested in this broad subject, including field theorists, computational and experimental physicists. The remote location in the charming village of Peyresq is ideal to promote discussions across generations and fields of specializations.

The event is co-sponsored by a travel grant from the ct.qmat cluster of DFG.
   

Organizing Committee

George Batrouni (Chair; University Côte d'Azur, France)
Fakher Assaad (Würzburg University, Germany)
Zi Yang Meng (University of Hong Kong, China)
Berge Englert (JSF; Beijing Institute of Technology, China; Centre for Quantum Technology, Singapore)
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Participants

Fabien Alet (University Paul Sabatier, Toulouse, France)
Andrei Bernevig (Princeton University, USA)
*Meng Chen (Yale University, USA)
Laura Classen (MPI Solid State Research, Stuttgart, Germany)
Dima Efetov (Ludwig Maximilians University, Munich, Germany)
Yin-Chen He ((State University of New York, Stony Brook, USA)
Johannes Hofmann (MPI Physics of Complex Systems, Dresden, Germany)
Lukas Janssen (Dresden University of Technology, Germany)
Yves Hon Kwan (UT Dallas, USA)
Tingxin Li (Shanghai Jiao Tong University, China)
Kin Fai Mak (MPI Structure and Dynamics of Matter, Hamburg, Germany, and Cornell University, USA)
*Raquel Queiroz (Columbia University, USA)
Nicolas Regnault (Flatiron Institute, USA)
Jie Shan (MPI Structure and Dynamics of Matter, Hamburg, Germany, and Cornell University, USA)
Dam Thanh Son (University of Chicago, USA)
Kai Sun (University of Michigan, USA)
Senthil Todadri (Massachusetts Institute of Technology, USA)
Päivi Törmä (Aalto University, Finland)
*Michael P Zaletel (UC Berkeley, USA)
*Wei Zhu (Westlake University, China)
* Pending confirmation
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Workshop Program

The workshop program will be available here.
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Venue and accommodation

The conference will be held at the beautiful village of Peyresq in the lower French Alps, which is administered by Peiresc Mundi. The entire village is the conference venue.

All participants will be accommodated at Peyresq, with all meals included.

The organizers will provide a bus to transport the workshop participants from Nice to Peyresq and back to Nice. The bus will leave from Nice to Peyresq on Sunday, 26 July, in the early afternoon. It will leave Peyresq back to Nice in the late morning of Sunday, 2 August.

Please arrange your arrival and departure times accordingly. You may want to arrive on Saturday, 25 July, and spend a night in Nice to be picked up by the bus on Sunday. And make similar allowances for the return. There are convenient hotels close to the airport.
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Contact

All communications about JSF-CFB should be emailed to admin@jsf-cfb.org.
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(Last updated on 31 October 2025)