Excited states from eigenvector continuation: The anharmonic oscillator
Excited states from eigenvector continuation: The anharmonic oscillator
复制标题
特征向量延拓的激发态:非简谐振子
DOI:
10.1016/j.physletb.2022.137101
复制
发表时间:
2021
影响因子:
4.4
通讯作者:
A. Schwenk
中科院分区:
文献类型:
--
作者:
Margarida Companys Franzke;A. Tichai;K. Hebeler;A. Schwenk
Eigenvector continuation (EC) has recently attracted a lot attention in nuclear structure and reactions as a variational resummation tool for many-body expansions. While previous applications focused on ground-state energies, excited states can be accessed on equal footing. This work is dedicated to a detailed understanding of the emergence of excited states from the eigenvector continuation approach. For numerical applications the one-dimensional quartic anharmonic oscillator is investigated, which represents a strongly non-perturbative quantum system where the use of standard perturbation techniques break down. We discuss how different choices for the construction of the EC manifold affect the quality of the EC resummation and investigate in detail the results from EC for excited states compared to results from a full diagonalization as a function of the basis-space size.
影响因子:
4.4
作者:
Furnstahl, R.J.;Garcia, A.J.;Millican, P.J.;Zhang, Xilin
通讯作者:
Zhang, Xilin
影响因子:
4.4
作者:
Melendez, J.A.;Drischler, C.;Garcia, A.J.;Furnstahl, R.J.;Zhang, Xilin
通讯作者:
Zhang, Xilin