Orbital-selective Mott transition and heavy fermion behavior in a bilayer Hubbard model for 3He

Abstract

Inspired by recent experiments on 3He films between one and two atoms thick, we consider a bilayer Hubbard model on a triangular lattice. Our results are obtained in the framework of a cluster dynamical mean-field calculation with a quantum Monte Carlo impurity solver. For appropriate model parameters, we observe an enhancement of the effective mass as the first layer approaches integer filling and the second remains only partially filled. At finite temperatures, this increase of the effective mass -- or, equivalently, the decrease of the coherence temperature -- leads to a crossover to a state where the first layer fermions localize, drop out of the Luttinger volume, and generate essentially free local moments. This finite temperature behavior is shown to be robust against the cluster size above some critical temperature. The zero temperature phase diagram, however, depends on the cluster topology. In particular, for clusters with an even number of unit cells, the growth of the effective mass is cut off by a first-order, orbital-selective Mott transition.

8 pages, 9 figures

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Cited by in corpus (12)

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• Realizing Quantum Materials with Helium: Helium films at ultralow temperatures, from strongly correlated atomically layered films to topological superfluidity
• Non-local correlations in the orbital selective Mott phase of a one dimensional multi-orbital Hubbard model
• Variational cluster approach to thermodynamic properties of interacting fermions at finite temperatures: A case study of the two-dimensional single-band Hubbard model at half filling
• Analytical slave-spin mean-field approach to orbital selective Mott insulators
• Quantum critical Mott transitions in a bilayer Kondo insulator-metal model system
• Orbital Selective Mott Transition Induced by Orbitals with Distinct Noninteracting Densities of States
• Ring-exchange periodic Anderson model for 3He bilayers
• Orbital Selective Phase Transition
• Spontaneous layer selective Mott phase in the bilayer Hubbard model
• Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations
• Selective Kondo screening and strange metallicity by sliding Dirac semimetals