"Twist-free quantum simulation of twisted bi-layer materials"

Who: Tymoteusz Salamon, ICFO, Spain

Place: Donostia International Physics Center

Date: Wednesday, 29 March 2023, 12:00

Quantum materials form one of the most prominent and prospective fields of quantum technologies. They make use of strong Inter-particle interactions to foster new, highly correlated phases of matte. Successful realisation of Magic Angle Twisted Bilayer Graphene (MATBG) has paved a new branch quantum materials - so called flat band systems. In these systems kinetic energy of the carriers is suppressed with respect to interactions allowing interactions to play a major role in system?s behaviour. However, new geometry of the system resulting from the twisting of one layer with respect to the other - known as Moiré pattern - effectively disables any attempts to study microscopic properties due to the huge size of the new supercell. In this talk I will present a twist-free quantum simulator - a platform based on ultra-cold neutral atoms in optical lattice, that mimics some of the fundamental properties of these highly complex 2D materials such as MATBG, but without a necessity of real twisting - hence no Moire patterns [2]

[1] Cao, Y., Fatemi, V., Fang, S. et al. Unconventional superconductivity in magic-angle graphene superlattices. Nature 556, 43?50 (2018).
[2] T. Salamon, A. Celi, R. W. Chhajlany, et. al. Simulating Twistronics without a Twist. Phys. Rev. Lett. 125, 030504

Host: Tobias Grass

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