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A fully general time-dependent multiconfiguration self-consistent-field method for the electron-nuclear dynamics.

Ryoji Anzaki1, Takeshi Sato2, Kenichi L Ishikawa2

  • 1Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan. anzaki@atto.t.u-tokyo.ac.jp.

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Summary
This summary is machine-generated.

We developed a new quantum dynamics method for complex systems with multiple particle types. This approach enables first-principles studies of correlated electron and nucleus behavior under intense light.

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Area of Science:

  • Quantum mechanics
  • Computational chemistry
  • Theoretical physics

Background:

  • Simulating the quantum dynamics of systems with mixed particle types (fermions and bosons) is computationally challenging.
  • Existing methods often lack the generality to handle arbitrary combinations of particles and configurations.

Purpose of the Study:

  • To introduce a fully general time-dependent multiconfiguration self-consistent-field (TDMCSCF) method.
  • To enable the accurate simulation of quantum dynamics for systems with diverse interacting fermions and bosons.

Main Methods:

  • The total wave function is represented as a superposition of configurations built from time-dependent spin-orbitals for each particle type.
  • Derivation of equations of motion for configuration-interaction (CI) coefficients and spin-orbitals.
  • The method supports general, not restricted to full-CI, configuration spaces.

Main Results:

  • A flexible theoretical framework for simulating quantum dynamics.
  • The method is applicable to systems with arbitrarily different kinds and numbers of interacting fermions and bosons.

Conclusions:

  • The developed TDMCSCF method offers a powerful tool for first-principles theoretical studies.
  • Enables investigation of correlated multielectron and multinucleus quantum dynamics in molecules, particularly under intense laser fields and attosecond pulses.