On the use of complex GTOs for the evaluation of radial integrals involving oscillating functions
- URL: http://arxiv.org/abs/2405.10032v1
- Date: Thu, 16 May 2024 12:15:02 GMT
- Title: On the use of complex GTOs for the evaluation of radial integrals involving oscillating functions
- Authors: Abdallah Ammar, Arnaud Leclerc, Lorenzo Ugo Ancarani,
- Abstract summary: We study two classes of radial integrals involving a product of bound and continuum one-electron states.
We investigate the reliability of this scheme for low-energy physical parameters.
This study serves as a premise in view of potential applications in molecular scattering processes.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We study two classes of radial integrals involving a product of bound and continuum one-electron states. Using a representation of the continuum part with an expansion on complex Gaussian Type Orbitals, such integrals can be performed analytically. We investigate the reliability of this scheme for low-energy physical parameters. This study serves as a premise in view of potential applications in molecular scattering processes.
Related papers
- Energy-filtered excited states and real-time dynamics served in a contour integral [0.0]
The Cauchy integral formula (CIF) can be used to represent holomorphic functions of diagonalizable operators on a finite domain.
I showcase a novel real-time electron dynamics (RT-EOM-CCSD) algorithm based on the CIF form of the exponential time-evolution operator.
arXiv Detail & Related papers (2024-09-11T15:39:50Z) - Self-energy correction to energy levels of highly charged ions in a path
integral formalism [0.17404865362620806]
We arrive at the full fermion propagator, using methods of functional integrals, in the form of Schwinger-Dyson equation (SDE)
From the full fermion SDE, the self-energy corrected propagator is identified and the energy shift is obtained from the poles of the spectral function.
arXiv Detail & Related papers (2023-09-27T11:45:18Z) - Calculating non-linear response functions for multi-dimensional
electronic spectroscopy using dyadic non-Markovian quantum state diffusion [68.8204255655161]
We present a methodology for simulating multi-dimensional electronic spectra of molecular aggregates with coupling electronic excitation to a structured environment.
A crucial aspect of our approach is that we propagate the NMQSD equation in a doubled system Hilbert space but with the same noise.
arXiv Detail & Related papers (2022-07-06T15:30:38Z) - Decimation technique for open quantum systems: a case study with
driven-dissipative bosonic chains [62.997667081978825]
Unavoidable coupling of quantum systems to external degrees of freedom leads to dissipative (non-unitary) dynamics.
We introduce a method to deal with these systems based on the calculation of (dissipative) lattice Green's function.
We illustrate the power of this method with several examples of driven-dissipative bosonic chains of increasing complexity.
arXiv Detail & Related papers (2022-02-15T19:00:09Z) - A complex Gaussian approach to molecular photoionization [0.0]
We develop and implement a Gaussian approach to calculate partial cross-sections and asymmetry parameters for molecular photoionization.
We show that all the necessary transition integrals become analytical, in both length and velocity gauges, thus facilitating the numerical evaluation of photoionization observables.
Illustrative results, presented for NH3 and H2O within a one-active-electron monocentric model, validate the proposed strategy.
arXiv Detail & Related papers (2021-11-16T17:26:04Z) - Multicenter integrals involving complex Gaussian type functions [0.0]
Multicentric integrals that involve a continuum state cannot be evaluated with the usual quantum chemistry tools.
We show how such integrals can be evaluated analytically by using a representation of the continuum state by a set of complex Gaussian functions.
arXiv Detail & Related papers (2021-11-16T16:58:55Z) - Spectral density reconstruction with Chebyshev polynomials [77.34726150561087]
We show how to perform controllable reconstructions of a finite energy resolution with rigorous error estimates.
This paves the way for future applications in nuclear and condensed matter physics.
arXiv Detail & Related papers (2021-10-05T15:16:13Z) - Entanglement dynamics of spins using a few complex trajectories [77.34726150561087]
We consider two spins initially prepared in a product of coherent states and study their entanglement dynamics.
We adopt an approach that allowed the derivation of a semiclassical formula for the linear entropy of the reduced density operator.
arXiv Detail & Related papers (2021-08-13T01:44:24Z) - Exact thermal properties of free-fermionic spin chains [68.8204255655161]
We focus on spin chain models that admit a description in terms of free fermions.
Errors stemming from the ubiquitous approximation are identified in the neighborhood of the critical point at low temperatures.
arXiv Detail & Related papers (2021-03-30T13:15:44Z) - Method of spectral Green functions in driven open quantum dynamics [77.34726150561087]
A novel method based on spectral Green functions is presented for the simulation of driven open quantum dynamics.
The formalism shows remarkable analogies to the use of Green functions in quantum field theory.
The method dramatically reduces computational cost compared with simulations based on solving the full master equation.
arXiv Detail & Related papers (2020-06-04T09:41:08Z) - Deep reinforcement learning for complex evaluation of one-loop diagrams
in quantum field theory [0.0]
We present a technique that allows for numerical analytic continuation of integrals encountered in one-loop diagrams in quantum field theory.
We train a reinforcement learning agent to perform the required contour deformations.
Our study shows great promise for an agent to be deployed in iterative numerical approaches used to compute non-perturbative 2-point functions.
arXiv Detail & Related papers (2019-12-27T19:45:24Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.