Quantum phase transition between orbital-selective Mott states in Hund's metals

Abstract

We report a quantum phase transition between orbital-selective Mott states, with different localized orbitals, in a Hund's metals model. Using the density matrix renormalization group, the phase diagram is constructed varying the electronic density and Hubbard $U$, at robust Hund's coupling. We demonstrate that this transition is preempted by charge fluctuations and the emergence of free spinless fermions, as opposed to the magnetically-driven Mott transition. The Luttinger correlation exponent is shown to have a universal value in the strong-coupling phase, whereas it is interaction dependent at intermediate couplings. At weak coupling we find a second transition from a normal metal to the intermediate-coupling phase.

5+3 pages, 5+4 figures

References in corpus (16)

• Strong electronic correlations from Hund's coupling
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• New Trends in Density Matrix Renormalization
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Orbital-Selective Mott transition out of band degeneracy lifting
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Hund's coupling key role in multi-orbital correlations
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• 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
• Metal-Insulator phase diagram and orbital selectivity in 3-orbital models with rotationally invariant Hund coupling
• Mott transition in Modulated Lattices and Parent Insulator of (K,Tl)yFexSe2 Superconductors
• Orbital differentiation and the role of orbital ordering in the magnetic state of Fe superconductors
• Magnetic States of the Two-Leg Ladder Alkali Metal Iron Selenides $A$Fe${}_2$Se${}_3$
• Emergence of a common energy scale close to the orbital-selective Mott transition

Cited by in corpus (7)

• Non-local correlations in the orbital selective Mott phase of a one dimensional multi-orbital Hubbard model
• Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension
• Block orbital-selective Mott insulators: a spin excitation analysis
• Prediction of exotic magnetic states in the alkali metal quasi-one-dimensional iron selenide compound Na${}_2$FeSe${}_2$
• Prediction of orbital selective Mott phases and block magnetic states in the quasi-one-dimensional iron chain Ce${}_2$O${}_2$FeSe${}_2$ under hole and electron doping
• Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model
• Kanamori-Moiré-Hubbard model for transition metal dichalcogenide homobilayers