Nonsequential double ionization with time-dependent renormalized-natural-orbital theory

Abstract

Recently introduced time-dependent renormalized natural orbital theory (TDRNOT) is tested on non-sequential double ionization (NSDI) of a numerically exactly solvable one-dimensional model He atom subject to few-cycle, 800-nm laser pulses. NSDI of atoms in strong laser fields is a prime example of non-perturbative, highly correlated electron dynamics. As such, NSDI is an important "worst-case" benchmark for any time-dependent few and many-body technique beyond linear response. It is found that TDRNOT reproduces the celebrated NSDI "knee," i.e., a many-order-of-magnitude enhancement of the double ionization yield (as compared to purely sequential ionization) with only the ten most significant natural orbitals (NOs) per spin. Correlated photoelectron spectra - as "more differential" observables - require more NOs.

7 pages, 5 figures, REVTeX

References in corpus (10)

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• A two-dimensional, two-electron model atom in a laser pulse: exact treatment, single active electron-analysis, time-dependent density functional theory, classical calculations, and non-sequential ionization
• Adiabatic Approximation of the Correlation Function in the Density-Functional Treatment of Ionization Processes
• Time-dependent natural orbitals and occupation numbers
• Calculation of photoelectron spectra within the time-dependent configuration interaction singles scheme
• Time-dependent density-functional and reduced density-matrix methods for few electrons: Exact versus adiabatic approximations
• Momentum distributions in time-dependent density functional theory: Product phase approximation for non-sequential double ionization in strong laser fields
• Multiconfigurational time-dependent Hartree-Fock calculations for photoionization of one-dimensional Helium
• Time-dependent renormalized natural orbital theory applied to the two-electron spin-singlet case: ground state, linear response, and autoionization
• Equations of motion for natural orbitals of strongly driven two-electron systems

Cited by in corpus (7)

• One-body reduced density-matrix functional theory in finite basis sets at elevated temperatures
• Restricted space ab initio models for double ionization by strong laser pulses
• Strong-field absorption and emission of radiation in two-electron systems calculated with time-dependent natural orbitals
• Strong-field ionization of atoms with $p^3$ valence shell: Two versus three active electrons
• Time-dependent renormalized-natural-orbital theory applied to laser-driven H${}_2^{+}$
• Density-Matrix Propagation Driven by Semiclassical Correlation
• Single-photon double ionization: renormalized-natural-orbital theory vs multi-configurational Hartree-Fock