Relativistic hyperpolarizabilities of atomic H,Li,and Be^(+)systems  

作　　者：Shan-Shan Lu Hong-Yuan Zheng Zong-Chao Yan James F.Babb Li-Yan Tang 卢闪闪;郑弘远;严宗朝;James F.Babb;唐丽艳

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Physics,University of New Brunswick,Fredericton,New Brunswick,E3B 5A3,Canada [4]ITAMP,Center for Astrophysics|Harvard&Smithsonian,60 Garden St.,Cambridge,MA 02138,USA

出　　处：《Chinese Physics B》2025年第2期230-239,共10页中国物理B(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12174402 and 12393821);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB0920100 and XDB0920101);the Nature Science Foundation of Hubei Province(Grant Nos.2019CFA058 and 2022CFA013);supported by the Natural Sciences and Engineering Research Council of Canada(NSERC);supported in part by NSF grant PHY-2116679.All the calculations are finished on the APM-Theoretical Computing Cluster(APMTCC)。

摘　　要：For atoms in external electric fields,the hyperpolarizabilities are the coefficients describing the nonlinear interactions contributing to the induced energies at the fourth power of the applied electric fields.Accurate evaluations of these coefficients for various systems are crucial for improving precision in advanced atom-based optical lattice clocks and for estimating field-induced effects in atoms for quantum information applications.However,there is a notable scarcity of research on atomic hyperpolarizabilities,especially in the relativistic realm.Our work addresses this gap by establishing a novel set of alternative formulas for the hyperpolarizability based on the fourth-order perturbation theory.These formulas offer a more reasonable regrouping of scalar and tensor components compared to previous formulas,thereby enhancing their correctness and applicability.To validate our formulas,we perform the calculations for the ground and low-lying excited pure states of few-electron atoms H,Li,and Be^(+).The highly accurate results obtained for the H atom could serve as benchmarks for further development of other theoretical methods.

关 键 词：HYPERPOLARIZABILITIES Stark effect fourth-order perturbation few-electron atoms 

分 类 号：O17[理学—数学]