Séminaire IMPMC/LPTMC Lorenzo Crippa

Salle de l'IMPMC (22-23, 4e étage, salle 401)

Modeling dynamical correlations in bilayer electronic materials

Two-dimensional electronic compounds, as well as systems composed of two or few such layers,
have recently been at the center of rapidly growing interest, for their remarkable tunability
and their wildly complex phase diagrams. They feature a wide range of properties
(correlated and topological insulators, superconductors, strange metals and more), which renders
them extremely interesting as a test bed for exotic electronic effects and, in perspective, for
applications to future electronic devices.
In this seminar, I will discuss some recent results of ours regarding two such systems, the
1T-1H TaS2 heterobilayer and Magic Angle Twisted Bilayer Graphene.
I will introduce the theoretical framework we employed to properly describe their electronic
correlations, based on Dynamical Mean-Field Theory and extension thereof, and discuss the
results of our simulations with regards to heavy fermion and local moment physics, ordering and
transport properties. I will provide comparisons with recent experimental results both from
Scanning Tunneling Microscopy and the new Quantum Twisting Microscope.
I will finally give some perspectives on the next steps of our analysis, with attention to
electron-phonon interaction, topology and superconductivity.

References
[1] Z.D. Song and B. A. Bernevig, Phys. Rev. Lett. 129, 047601 (2022)
[2] D. Wong et al, Nature 582, pages 198–202 (2020)
[3] J. Xiao et al, arXiv:2506.20738
[4] H. Kim et al, arXiv:2505.17200
[5] G.Rai et al, Phys. Rev. X 14, 031045 (2024)
[6] W. Ruan et al, Nat. Phys. 17, 1154 (2021)
[7] V. Vaňo et al, Nature 599, 582 (2021)
[8] L. Crippa et al. Nat. Commun. 15, 1357 (2024)