Orbital-selective thermalization plateau in the mass imbalanced Hubbard model

Abstract

We use time-dependent non-equilibrium dynamical mean-field theory with weak-coupling auxiliary-field continuous time quantum Monte Carlo as an impurity solver to study the thermalization behavior of the mass-imbalanced single-band Hubbard model after a quench of the Coulomb interaction from the non-interacting limit to a finite positive value. By contrast, when the Coulomb interaction in our model is increased under equilibrium conditions, the quasi-particle weight for spin-up and spin-down (the mass imbalance) electrons approach zero simultaneously, indicating the absence of an orbital selective Mott transition. Our out-of-equilibrium study suggests that there exists a time window where an orbital selective dynamical phase transition occurs. The dynamical phase transition is characterized by the relaxation behavior of energy (kinetic and Coulomb interaction) and the spin-resolved momentum-dependent occupation. To make connection with possible experiments, we calculate the spin-resolved two-time optical conductivity, which confirms the orbital-selective thermalization plateau. We find the time window for the orbital selective dynamical phase transition grows as the mass imbalance increases.

8 pages, 8 figures

References in corpus (15)

• Continuous-time Monte Carlo methods for quantum impurity models
• Quench dynamics and non equilibrium phase diagram of the Bose-Hubbard model
• Interaction Quench in the Hubbard model
• Dynamical phase transition in correlated fermionic lattice systems
• Strongly correlated fermions after a quantum quench
• Continuous-time auxiliary field Monte Carlo for quantum impurity models
• Quantum degenerate two-species Fermi-Fermi mixture coexisting with a Bose-Einstein condensate
• Time-Dependent Mean Field Theory for Quench Dynamics in correlated electron systems
• Disentangling the electronic and phononic glue in a high-Tc superconductor
• Nonthermal steady states after an interaction quench in the Falicov-Kimball model
• Nonthermal antiferromagnetic order and nonequilibrium criticality in the Hubbard model
• Dynamical band flipping in fermionic lattice systems: An ac-field-driven change of the interaction from repulsive to attractive
• Theory of time-resolved optical spectroscopy on correlated electron systems
• Quadratic band touching points and flat bands in two-dimensional topological Floquet systems
• Emergent ultrafast phenomena in correlated oxides and heterostructures