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Interaction-resistant metals in multicomponent Fermi systems
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DOI：10.1103/PhysRevB.103.205132.png)
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摘要
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We analyze two different fermionic systems that defy Mott localization showing a metallic ground state at integer filling and very large Coulomb repulsion. The first is a multiorbital Hubbard model with a Hund's coupling (this physics has been widely studied, and the new metallic state is called a Hund's metal), and the second is a SU(3) Hubbard model with a patterned single-particle potential designed to display a similar interaction-resistant metal in a setup which can be implemented with SU(N) ultracold atoms. With simple analytical arguments and exact numerical diagonalization of the Hamiltonians for a minimal three-site system, we demonstrate that the interaction-resistant metal emerges in both cases as a compromise between two different insulating solutions which are stabilized by different terms of the models. This provides strong evidence that the Hund's metal is a specific realization of a more general phenomenon which can be realized in various strongly correlated systems.
Keyword:
MOTT INSULATOR
DRUDE WEIGHT
HUBBARD
RING
STATES
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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