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.A Mott insulator forms when strong interactions between particles cause them to become localized. A cold atom simulator has now been used to realize a selective Mott insulator in which atoms are localized or propagating depending on their spin state.

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. - 18:10(2022), pp. 1201-1205. [10.1038/s41567-022-01726-5]

Flavour-selective localization in interacting lattice fermions

Baumann K.;Del Re L.;Inguscio M.;Capone M.;Fallani L.
2022-01-01

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.A Mott insulator forms when strong interactions between particles cause them to become localized. A cold atom simulator has now been used to realize a selective Mott insulator in which atoms are localized or propagating depending on their spin state.
2022
18
10
1201
1205
10.1038/s41567-022-01726-5
https://www.nature.com/articles/s41567-022-01726-5
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 identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/135850
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