Interaction-resistant metals in multicomponent Fermi systems

Abstract

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, where 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 set-up 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 a 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.

arXiv comment11 pages, 11 figures

References in corpus (63)

• Quantum Cluster Theories
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Observation of chiral edge states with neutral fermions in synthetic Hall ribbons
• Two-orbital SU(N) magnetism with ultracold alkaline-earth atoms
• Cellular Dynamical Mean Field Approach to Strongly Correlated Systems
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Ultracold Atoms in a Tunable Optical Kagome Lattice
• A one-dimensional liquid of fermions with tunable spin
• A lattice of double wells for manipulating pairs of cold atoms
• Spectroscopic observation of SU(N)-symmetric interactions in Sr orbital magnetism
• Observation of two-orbital spin-exchange interactions with ultracold SU(N)-symmetric fermions
• An SU(N) Mott insulator of an atomic Fermi gas realized by large-spin Pomeranchuk cooling
• Selective Mottness as a key to iron superconductors
• Janus-faced influence of the Hund's rule coupling in strongly correlated materials
• Collisional stability of a three-component degenerate Fermi gas
• Three-body recombination in a three-state Fermi gas with widely tunable interactions
• Ultracold Gases of Ytterbium: Ferromagnetism and Mott States in an SU(6) Fermi System
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Orbital-Selective Mott transition out of band degeneracy lifting
• Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
• Cluster Perturbation Theory for Hubbard models
• Bond-order-wave phase and quantum phase transitions in the one-dimensional extended Hubbard model
• Ultracold quantum gases in triangular optical lattices
• Hund's coupling key role in multi-orbital correlations
• From band insulator to Mott insulator in one dimension
• Direct observation of coherent inter-orbital spin-exchange dynamics
• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• Observation of an orbital interaction-induced Feshbach resonance in 173-Yb
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Does the attractive Hubbard model support larger persistent currents than the repulsive one ?
• A strongly interacting gas of two-electron fermions at an orbital Feshbach resonance
• DMFT+NRG study of spin-orbital separation in a three-band Hund's metal
• Orbital Feshbach Resonance in Alkali-Earth Atoms
• Can correlations drive a band insulator metallic?
• Quantum critical behavior of the one-dimensional ionic Hubbard model
• Orbital Selectivity in Hund's metals: The Iron Chalcogenides
• U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
• Orbital-selective Mott transitions: Heavy fermions and beyond
• Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition
• Electronic correlations in Hund metals
• Dynamical behavior across the Mott transition of two bands with different bandwidths
• Nature of the insulating phases in the half-filled ionic Hubbard model
• A quantum Monte Carlo study of the one-dimensional ionic Hubbard model
• Exploring competing density order in the ionic Hubbard model with ultracold fermions
• Metallic phase in the two-dimensional ionic Hubbard model
• Exact Bond Ordered Ground State for the Transition Between the Band and the Mott Insulator
• Charge disproportionation, mixed valence, and Janus effect in multiorbital systems: A tale of two insulators
• Quantum phase diagram of the generalized ionic Hubbard model for AB${}_n$ chains
• Nonlocal correlations induced by Hund's coupling: a cluster DMFT study
• Superfluidity and Chaos in low dimensional circuits
• Hubbard model: Pinning of occupation numbers and role of symmetries
• Selective insulators and anomalous responses in correlated fermions with synthetic extra dimensions
• The mixing-demixing phase diagram of ultracold heteronuclear mixtures in a ring trimer
• Phase separation can be stronger than chaos
• Probing the bond order wave phase transitions of the ionic Hubbard model by superlattice modulation spectroscopy
• The effective Kondo model for a trimer on a metallic surface
• Pathway toward the formation of supermixed states in ultracold boson mixtures loaded in ring lattices
• Synergy between Hund-driven correlations and boson-mediated Superconductivity
• The phase-separation mechanism of a binary mixture in a ring trimer
• Is there a superconducting phase in the half-filled ionic Hubbard model ?
• (Spin-)density-functional theory for open-shell systems: exact magnetization density functional for the half-filled Hubbard trimer
• Spatial Phase Separation of a Binary Mixture in a Ring Trimer
• Entropy and specific heat of the infinite-dimensional three-orbital Hubbard model

Cited by in corpus (23)

• Atomtronic circuits: from many-body physics to quantum technologies
• Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
• Perspective on new implementations of atomtronic circuits
• Making ghost vortices visible in two-component Bose-Einstein condensates
• Persistent currents in ultracold gases
• Variational Quantum Eigensolver for SU($N$) Fermions
• Quasilocal entanglement across the Mott-Hubbard transition
• Enhancement of chiral edge currents in ($d$+1)-dimensional atomic Mott-band hybrid insulators
• Probe for bound states of SU(3) fermions and colour deconfinement
• Metal-insulator transition and local-moment collapse in negative charge-transfer CaFeO${}_3$ under pressure
• Charge disproportionation and Hund's insulating behavior in a five-orbital Hubbard model applicable to $d^4$ perovskites
• Interference dynamics of matter-waves of SU($N$) fermions
• Hund bands in spectra of multiorbital systems
• Competing Correlated Insulators in multi-orbital systems coupled to phonons
• Engineering the Kondo impurity problem with alkaline-earth atom arrays
• Persistent currents in a strongly interacting multicomponent Bose gas on a ring
• Mott-Enhanced Exciton Condensation in a Hubbard bilayer
• Nematic spectral signatures of the Hund's metal
• Phase diagram of disordered Bose-Hubbard model based on mean-field and percolation analysis in two dimensions and at fixed $n=1$ filling
• Repulsion driven metallic phase in the ground state of the half-filled $t-t^{\prime }$ ionic Hubbard chain
• Theoretical description of atomtronic Josephson junctions in an optical lattice
• Probing Superfluidity with Quantum Vortex Necklaces
• Phase diagram of the SU$(3)$ Fermi-Hubbard model with next-neighbor interactions