Quench dynamics of Anderson impurity model using configuration interaction method
arXiv:1510.06945 · doi:10.1103/PhysRevB.92.155135
Abstract
We study the quench dynamics of an Anderson impurity model using the configuration interaction (CI) method. In particular, we focus on the relaxation behavior of the impurity occupation. The system is found to behave very differently in the weak-coupling and strong-coupling regimes. In the weak-coupling regime, the impurity occupation relaxes to a time-independent constant quickly after only a few oscillations. In the strong-coupling regime, the impurity occupation develops a fast oscillation, with a much slower relaxation. We show that it is the multi-peak structure in the many-body energy spectrum that separates these two regimes. The characteristic behavior, including the power-law decay and the period of oscillation, can also be related to certain features in the many-body energy spectrum. The respective advantages of several impurity solvers are discussed, and the convergence of different CI truncation schemes is provided.
14 pages single column
References in corpus (17)
- Thermalization and its mechanism for generic isolated quantum systems
- Fermi-liquid instabilities at magnetic quantum phase transitions
- Continuous-time Monte Carlo methods for quantum impurity models
- The numerical renormalization group method for quantum impurity systems
- Quench dynamics and non equilibrium phase diagram of the Bose-Hubbard model
- Breakdown of thermalization in finite one-dimensional systems
- Interaction Quench in the Hubbard model
- Dynamical phase transition in correlated fermionic lattice systems
- Real-time dynamics in Quantum Impurity Systems: A Time-dependent Numerical Renormalization Group Approach
- Diagrammatic Monte Carlo simulation of non-equilibrium systems
- On steady-state currents through nano-devices: a scattering-states numerical renormalization group approach to open quantum systems
- Quantum Quenches, Thermalization and Many-Body Localization
- Quantum chaos and thermalization in gapped systems
- Nonthermal antiferromagnetic order and nonequilibrium criticality in the Hubbard model
- Truncated Configuration Interaction expansions as solvers for correlated quantum impurity models and dynamical mean field theory
- Multiconfiguration time-dependent Hartree impurity solver for nonequilibrium dynamical mean-field theory
- Time-Dependent Numerical Renormalization Group Method for Multiple Quenches: Application to General Pulses and Periodic Driving