Interaction-resistant metals in multicomponent Fermi systems

Richaud, Andrea; Ferraretto, Matteo; Capone, Massimo

doi:10.1103/physrevb.103.205132

Cited by 25 publications

(18 citation statements)

References 69 publications

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“…They are two stripes centered about the lines µ/U = 1 and µ/U = 2, which represent the two degeneracy conditions for the three solutions of the atomic limit, i.e., E MI = E I NT and E I NT = E BI , respectively (see Section 3.1). In analogy with the physics of multiorbital correlated materials [9,11] (see also Appendix A), we find that the competition between two different correlated insulators gives place to a persistently metallic solution. 5)) as a function of U/t and µ/t, for a system of L = 3 sites, global filling n i = 2 and flux Φ = 0.4π.…”

Section: Interaction-resilient Metallicitysupporting

confidence: 55%

“…It is in this spirit that an optical superlattice, i.e., an extra site-dependent single-particle potential, is introduced in Section 3. The ensuing model has been shown to effectively mimic the physics of Hund's metals in an experimentally accessible ultracold atomic platform [9,11].…”

Section: The Su(n) Hubbard Model: Basic Properties and Some Extensionsmentioning

confidence: 99%

“…In Ref. [11], we showed that Hund's metal is just a specific realization of a more general phenomenon, which can be present in various strongly correlated systems. In particular, we showed that an SU(3) Hubbard model with patterned single-particle potential can be engineered in such a way to trigger the emergence of interaction-resilient metallicity.…”

Section: Mimicking Hund's Physics Via Su(n) Ultracold Atomsmentioning

confidence: 99%

“…As the competition between the Coulomb repulsion U and Hund's exchange coupling J results in the emergence of Hund's metals (see Appendix A) in multiorbital materials, so, in our SU(3)-symmetric atomic platform, the competition between U and the single-particle patterned potential µ results in persistently metallic solutions. To illustrate the occurrence of this phenomenon, we showed that it is possible to focus on a minimal cluster of three sites [11], which can be regarded as the elementary building block of larger and higherdimensional lattices, as well as of more sophisticated quantum cluster theories [50][51][52][53]. This choice allowed us to capture the essential physics of the problem and, in parallel, to develop simple analytical arguments and the exact numerical diagonalization of the associated Hamiltonian.…”

Section: Competing Correlated Insulatorsmentioning

confidence: 99%

“…In the case of solid-state multiorbital models, the U-term penalizes spatial charge fluctuations (local occupancies different from the average filling), while the J-term favors high-spin configurations and, to a lesser degree, high orbital angular momentum [1][2][3]. This competition results in an extremely rich scenario of intriguing quantum phases, such as orbital-selective Mott phases (where some bands undergo Mott localization, while others remain metallic) [4][5][6][7], orbital-selective superconductors [8] and the so-called "Hund's metal" [2,[9][10][11][12]. These regimes, besides their conceptual interest, have been invoked to understand the properties of different materials, among which iron-based superconductors [13,14] and ruthenates [15].…”

Section: Introductionmentioning

confidence: 99%

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Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

2022

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The physics of many interesting correlated materials can be captured by multiorbital Hubbard models, where conduction electrons feature an additional orbital degree of freedom. The multiorbital characteristic is not a mere complication, but it leads to an immensely richer landscape of physical regimes. One of the key features is the interplay between Hubbard repulsion and Hund’s exchange coupling, which has been shown to lead to orbital-selective correlations and to the existence of correlation-resilient metals (usually called Hund’s metals) defying Mott localization. Here, we show that experimentally available platforms of SU(N)-symmetric ultracold atoms can indeed mimic the rich physics disclosed by multiorbital materials, by exploiting the internal degrees of freedom of multicomponent atoms. We discuss in detail the SU(N) version of interaction-resilient Hund’s metal and some other interesting regimes.

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Section: Interaction-resilient Metallicitysupporting

confidence: 55%

Section: The Su(n) Hubbard Model: Basic Properties and Some Extensionsmentioning

confidence: 99%

Section: Mimicking Hund's Physics Via Su(n) Ultracold Atomsmentioning

confidence: 99%

Section: Competing Correlated Insulatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

2022

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Probe for bound states of SU(3) fermions and colour deconfinement

et al. 2023

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Fermionic artificial matter realized with cold atoms grants access to an unprecedented degree of control on sophisticated many-body effects with an enhanced flexibility of the operating conditions. Here, we consider three-component fermions with attractive interactions to study the formation of complex bound states, whose nature goes beyond the standard fermion pairing occurring in quantum materials. Such systems display clear analogies with quark matter. We address the nature of the bound states of a three-component fermionic system in a ring-shaped trap through the persistent current. In this way, we demonstrate that we can distinguish between color superfluid and trionic bound states. By analyzing finite temperature effects, we show how finite temperature can lead to the deconfinement of bound states. For weak interactions, the deconfinement occurs because of scattering states. In this regime, the deconfinement depends on the trade-off between interactions and thermal fluctuations. For strong interactions the features of the persistent current result from the properties of a suitable gas of bound states.

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Defect induced nonequilibrium quantum dynamics in an interacting Bose–Hubbard flux ladder

et al. 2023

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The interacting Bose-Hubbard flux ladder provides an ideal model to probe novel quantum phenomena of many-body systems. Here, we report on the first direct observation of dynamical quantum phase transition (DQPT) in interacting Bose-Hubbard flux ladder induced by defect perturbation, which provides a new scheme for experimental design and manipulation of the DQPT in ultracold atomic system. Under the mean-field approximation, DQPT is identified by resolving the order parameter and the temporal evolution of patterns of atomic density distributions and local current configurations of the system. The threshold for occurrence of DQPT is obtained analytical and the physical mechanism of DQPT is revealed explicitly. Periodic appearance and annihilation of dynamical vortex and the manifestation of symmetry restoration after perturbation from broken-symmetry phase are observed. A thorough connection among the order parameter dynamics, the underlying ground state phase transition and nonequilibrium dynamics is established in real time and real space for the first time. Interestingly, by quenching the defect, the underlying ground state phases are captured, which provides a feasible dynamical measurement scheme for the observation of the underlying ground state phase which is challenging to reach experimentally.

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Interaction-resistant metals in multicomponent Fermi systems

Cited by 25 publications

References 69 publications

Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

Probe for bound states of SU(3) fermions and colour deconfinement

Defect induced nonequilibrium quantum dynamics in an interacting Bose–Hubbard flux ladder

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