We study the evolution properties of spin-boson systems by a systematic numerical iteration approach,which performs well in the whole coupling regime.This approach evaluates a set of coefficients in the formal express...We study the evolution properties of spin-boson systems by a systematic numerical iteration approach,which performs well in the whole coupling regime.This approach evaluates a set of coefficients in the formal expression of the time-dependent Schr?dinger equation by expanding the initial state in Fock space.This set of coefficients is unique for the spin-boson Hamiltonian studied,allowing one to calculate the time evolution from different initial states.To complement our numerical calculations,we apply the method to the Buck–Sukumar model.We find that when the ground-state energy of the model is unbounded and no ground state exists in a certain parameter space,the time evolution of the physical quantities is naturally unstable.展开更多
基金supported by the National Natural Science Foundation of China under Grant Nos.11835011 and 11774316。
文摘We study the evolution properties of spin-boson systems by a systematic numerical iteration approach,which performs well in the whole coupling regime.This approach evaluates a set of coefficients in the formal expression of the time-dependent Schr?dinger equation by expanding the initial state in Fock space.This set of coefficients is unique for the spin-boson Hamiltonian studied,allowing one to calculate the time evolution from different initial states.To complement our numerical calculations,we apply the method to the Buck–Sukumar model.We find that when the ground-state energy of the model is unbounded and no ground state exists in a certain parameter space,the time evolution of the physical quantities is naturally unstable.
