Influence of Magnetism and Correlation on the Spectral Properties of Doped Mott Insulators

Abstract

Unravelling the nature of doping-induced transition between a Mott insulator and a weakly correlated metal is crucial to understanding novel emergent phases in strongly correlated materials. For this purpose, we study the evolution of spectral properties upon doping Mott insulating states, by utilizing the cluster perturbation theory on the Hubbard and t-J-like models. Specifically, a quasi-free dispersion crossing the Fermi level develops with small doping, and it eventually evolves into the most dominant feature at high doping levels. Although this dispersion is related to the free electron hopping, our study shows that this spectral feature is in fact influenced inherently by both electron-electron correlation and spin exchange interaction: the correlation destroys coherence, while the coupling between spin and mobile charge restores it in the photoemission spectrum. Due to the persistent impact of correlations and spin physics, the onset of gaps or the high-energy anomaly in the spectral functions can be expected in doped Mott insulators.

10 pages, 7 figures

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Cited by in corpus (11)

• Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb)${}_2$(Sr,La)${}_2$CuO${}_{6+\delta }$ cuprate superconductor family
• The Hubbard model on the honeycomb lattice: from static and dynamical mean-field theories to lattice quantum Monte Carlo simulations
• Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model
• Numerical Investigation of Spin Excitations in a Doped Spin Chain
• Emergence of Quasiparticles in a Doped Mott Insulator
• Spectral functions of the honeycomb lattice with both the Hubbard and long-range Coulomb Interactions
• Effect of short-range correlations on spectral properties of doped Mott insulators
• Functional renormalization group for extremely correlated electrons
• The fate of the spin polaron in the 1D antiferromagnets
• Exploring kinetically induced bound states in triangular lattices with ultracold atoms: spectroscopic approach
• Bad Metal Behavior and Lifshitz Transition of a Nagaoka Ferromagnet