A large repulsion between particles in a quantum system can lead to their localization, an effect responsible for the Mott insulator phases in strongly correlated materials. In a system with multiple orbitals, an orbital-selective Mott insulator can form, where electrons in some orbitals are predicted to localize while others remain itinerant. Here we demonstrate a more general version of this phenomenon by observing flavour-selective localization in an atom-based quantum simulator. Our experiment realizes Fermi–Hubbard models with an SU(3) symmetry that can be broken using a tunable coupling between flavours. We observe an enhancement of the localization associated with a selective Mott transition and the emergence of flavour-dependent correlations. Our realization of flavour-selective Mott physics demonstrates the potential of cold atoms to simulate interacting multicomponent materials such as superconductors and topological insulators.

Flavour-selective localization in interacting lattice fermions / Tusi, D.; Franchi, L.; Livi, L. F.; Baumann, K.; Benedicto Orenes, D.; Del Re, L.; Barfknecht, R. E.; Zhou, T.-W.; Inguscio, M.; Cappellini, G.; Capone, M.; Catani, J.; Fallani, L.. - In: NATURE PHYSICS. - ISSN 1745-2473. - STAMPA. - 18:(2022), pp. 1201-1205. [10.1038/s41567-022-01726-5]

Flavour-selective localization in interacting lattice fermions

Tusi, D.;Franchi, L.;Livi, L. F.;Cappellini, G.;Catani, J.;Fallani, L.
2022

Abstract

A large repulsion between particles in a quantum system can lead to their localization, an effect responsible for the Mott insulator phases in strongly correlated materials. In a system with multiple orbitals, an orbital-selective Mott insulator can form, where electrons in some orbitals are predicted to localize while others remain itinerant. Here we demonstrate a more general version of this phenomenon by observing flavour-selective localization in an atom-based quantum simulator. Our experiment realizes Fermi–Hubbard models with an SU(3) symmetry that can be broken using a tunable coupling between flavours. We observe an enhancement of the localization associated with a selective Mott transition and the emergence of flavour-dependent correlations. Our realization of flavour-selective Mott physics demonstrates the potential of cold atoms to simulate interacting multicomponent materials such as superconductors and topological insulators.
2022
18
1201
1205
Tusi, D.; Franchi, L.; Livi, L. F.; Baumann, K.; Benedicto Orenes, D.; Del Re, L.; Barfknecht, R. E.; Zhou, T.-W.; Inguscio, M.; Cappellini, G.; Capone, M.; Catani, J.; Fallani, L.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1281719
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