Relativistic Normal Coupled-Cluster Theory for Accurate Determination of Electric Dipole Moments of Atoms: First Application to the ^{199}Hg Atom.
Relativistic Normal Coupled-Cluster Theory for Accurate Determination of Electric Dipole Moments of Atoms: First Application to the ^{199}Hg Atom.
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DOI：
10.1103/physrevlett.120.203001
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发表时间：
2018-01
影响因子：
8.6
通讯作者：
B. Sahoo;B. Das
中科院分区：
文献类型：
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作者：
B. Sahoo;B. Das
最近由于宇称和时间反转破坏（P，T奇）相互作用而对反磁性原子的电偶极矩（EDM）进行的相对论耦合簇（RCC）计算是探索粒子相互作用标准模型之外的新物理的重要组成部分，与之前的理论结果有很大不同。因此，有必要对这些结果的有效性进行独立测试。鉴于此，普通耦合团簇方法被扩展到相对论体系[相对论普通耦合团簇（RNCC）方法]，通过同时结合静电和P,T奇相互作用来计算原子的EDM，以克服普通RCC方法的缺点。这种新的相对论方法已应用于 ^{199}Hg，目前它的 EDM 限制比任何其他系统都低。我们发现该原子的 EDM 的 RNCC 和自洽 RCC 计算结果很接近。一方面阐明了这两个结果与之前计算结果之间的差异。此外，还评估了该原子的电偶极子极化率，其与 EDM 具有计算相似性，并且与其测量值非常吻合。
Recent relativistic coupled-cluster (RCC) calculations of electric dipole moments (EDMs) of diamagnetic atoms due to parity and time-reversal violating (P,T-odd) interactions, which are essential ingredients for probing new physics beyond the standard model of particle interactions, differ substantially from the previous theoretical results. It is therefore necessary to perform an independent test of the validity of these results. In view of this, the normal coupled-cluster method has been extended to the relativistic regime [relativistic normal coupled-cluster (RNCC) method] to calculate the EDMs of atoms by simultaneously incorporating the electrostatic and P,T-odd interactions in order to overcome the shortcomings of the ordinary RCC method. This new relativistic method has been applied to ^{199}Hg, which currently has a lower EDM limit than that of any other system. The results of our RNCC and self-consistent RCC calculations of the EDM of this atom are found to be close. The discrepancies between these two results on the one hand and those of previous calculations on the other are elucidated. Furthermore, the electric dipole polarizability of this atom, which has computational similarities with the EDM, is evaluated and it is in very good agreement with its measured value.