Flavour-Selective Localization in Interacting Lattice Fermions via SU(N) Symmetry Breaking
May 5th, 2021 ELETTRA NERI Ultracold Quantum Gases
ICFO-The Institute of Photonics Sciences

Each week we present and discuss publications out of the world of atomic, molecular and optical (AMO) physics. Topics are of experimental and theoretical relevance.

This week, Elettra Neri (Ultracold Quantum Gases) will present:
Paper: 'Flavour-selective localization in interacting lattice fermions via SU(N) symmetry breaking'

A large repulsion between particles in a quantum system can lead to their localization, as it happens for the electrons in Mott insulating materials. This paradigm has recently branched out into a new quantum state, the orbital-selective Mott insulator, where electrons in some orbitals are predicted to localize, while others remain itinerant. We provide a direct experimental realization of this phenomenon, that we extend to a more general flavour-selective localization. By using an atom-based quantum simulator, we engineer SU(3) Fermi-Hubbard models breaking their symmetry via a tunable coupling between flavours, observing an enhancement of localization and the emergence of flavour-dependent correlations. Our realization of flavour-selective Mott physics opens the path to the quantum simulation of multicomponent materials, from superconductors to topological insulators.


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