On the multi-layer multi-configurational time-dependent Hartree approach for bosons and fermions.

On the multi-layer multi-configurational time-dependent Hartree approach for bosons and fermions.
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关于玻色子和费米子的多层多配置时间相关 Hartree 方法。

DOI:
10.1063/1.4975662
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发表时间:
2017
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
Thomas Weike
Thomas Weike
中科院分区:
--
文献类型:
--
作者:
U. Manthe;Thomas Weike

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介绍了一种基于优化含时轨道的二次量化表示(SQR)的多层多构型含时Hartree(MCTDH)方法。该方法结合了Wang和Thoss的多层MCTDH-SQR方法的元素,该方法采用了预先选择的与时间无关的轨道基础,以及用于玻色子和多配置与时间相关的Hartree-Fock方法的MCTDH,该方法不使用多层,但采用与时间相关的轨道基础。与现有的MCTDH型方法相比,本方法对于给定数量的配置的结果相对于时间依赖的轨道基的酉变换不是不变的。因此,选择自然的轨道表示,以实现相对于所采用的配置的数量的快速收敛。运动方程的本animals,称为(多层)MCTDH在优化的第二量化表示,推导出。此外,给出了一种计算优化的未占据单粒子函数的方案,该方案可用于避免运动方程中的奇异性。
A multi-layer multi-configurational time-dependent Hartree (MCTDH) approach using a second quantization representation (SQR) based on optimized time-dependent orbitals is introduced. The approach combines elements of the multi-layer MCTDH-SQR approach of Wang and Thoss, which employs a preselected time-independent orbital basis, and the MCTDH for bosons and multi-configuration time-dependent Hartree-Fock approaches, which do not use multi-layering but employ time-dependent orbital bases. In contrast to existing MCTDH-type approaches, the results of the present approach for a given number of configurations are not invariant with respect to unitary transformations of the time-dependent orbital basis. Thus a natural orbital representation is chosen to achieve fast convergence with respect to the number of configurations employed. Equations of motion for the present ansatz, called (multi-layer) MCTDH in optimized second quantization representation, are derived. Furthermore, a scheme for the calculation of optimized unoccupied single-particle functions is given which can be used to avoid singularities in the equations of motion.
DOI: 10.1103/physreva.92.043627
发表时间: 2015-10-27
期刊: PHYSICAL REVIEW A
影响因子: 2.9
作者:
Beinke, Raphael;Klaiman, Shachar;Alon, Ofir E.
通讯作者: Alon, Ofir E.
DOI: 10.1063/1.3682091
发表时间: 2012
期刊: The Journal of chemical physics
影响因子: --
作者:
I. S. Ulusoy;M. Nest
通讯作者: M. Nest