Microscopic response theory for strongly coupled superfluid fermionic systems

Microscopic response theory for strongly coupled superfluid fermionic systems
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强耦合超流费米子系统的微观响应理论

DOI:
10.1103/physrevc.106.064316
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发表时间:
2022
期刊:
影响因子:
3.1
通讯作者:
Zhang, Yinu
Zhang, Yinu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Litvinova, Elena;Zhang, Yinu

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建立了强耦合超流费米子系统响应的自洽微观理论。在Bogolyubov准粒子的基础上将响应定义为两点两费米子关联函数后,运动方程(EOM)方法应用于最一般的费米子哈密顿量与裸露的两体相互作用,也转化为准粒子空间。作为正常相的情况下的超流扩展,由此产生的EOM是Bethe-Salpeter-Dyson形式的静态和动态相互作用内核,其中前者决定的短程关联和后者是负责的长程的。与正常相位相比,两个核以及整个EOM具有双倍维度。通过集群分解的动力学内核的非微扰近似进行了讨论,主要集中在一个连续的推导准粒子-声子耦合变体的后一个内核,其中的声子(振动)是复合相关的两个准粒子状态统一的正常和配对模式。所发展的理论被用于核结构的应用,如各种通道中的核响应。特别是,有限振幅方法广义超越准粒子随机相位近似,考虑准粒子振动耦合,制定前瞻性的计算在非球形核。
A consistent microscopic theory for the response of strongly coupled superfluid fermionic systems is formulated. After defining the response as a two-point two-fermion correlation function in the basis of the Bogolyubov quasiparticles, the equation of motion (EOM) method is applied using the most general fermionic Hamiltonian with a bare two-body interaction, also transformed to the quasiparticle space. As a superfluid extension of the case of the normal phase, the resulting EOM is of the Bethe-Salpeter-Dyson form with the static and dynamical interaction kernels, where the former determines the short-range correlations and the latter is responsible for the long-range ones. Both kernels as well as the entire EOM have the double dimension as compared to that of the normal phase. Nonperturbative approximations via the cluster decomposition of the dynamical kernel are discussed, with the major focus on a continuous derivation of the quasiparticle-phonon coupling variant of the latter kernel, where the phonons (vibrations) are composite correlated two-quasiparticle states unifying both the normal and pairing modes. The developed theory is adopted for nuclear structure applications, such as the nuclear response in various channels. In particular, the finite-amplitude method generalized beyond the quasiparticle random phase approximation, taking into account the quasiparticle-vibration coupling, is formulated for prospective calculations in nonspherical nuclei.
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