Journal
PHYSICAL REVIEW A
Volume 97, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.023423
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [25286064, 26390076, 26600111, 16H03881]
- Photon Frontier Network Program of MEXT
- Center of Innovation Program from the Japan Science and Technology Agency, JST
- CREST [JPMJCR15N1]
- Graduate School of Engineering, The University of Tokyo, Doctoral Student Special Incentives Program (SEUT Fellowship)
- Grants-in-Aid for Scientific Research [16H03881, 26600111, 26390076, 25286064] Funding Source: KAKEN
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We present a numerical implementation of the infinite-range exterior complex scaling [Scrinzi, Phys. Rev. A 81, 053845 (2010)] as an efficient absorbing boundary to the time-dependent complete-active-space self-consistent field method [Sato, Ishikawa, Brezinova, Lackner, Nagele, and Burgdorfer, Phys. Rev. A 94, 023405 (2016)] for multielectron atoms subject to an intense laser pulse. We introduce Gauss-Laguerre-Radau quadrature points to construct discrete variable representation basis functions in the last radial finite element extending to infinity. This implementation is applied to strong-field ionization and high-harmonic generation in He, Be, and Ne atoms. It efficiently prevents unphysical reflection of photoelectron wave packets at the simulation boundary, enabling accurate simulations with substantially reduced computational cost, even under significant (approximate to 50%) double ionization. For the case of a simulation of high-harmonic generation from Ne, for example, 80% cost reduction is achieved, compared to a mask-function absorption boundary.
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