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Related Experiment Video

Updated: Feb 4, 2026

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Time-Dependent Multicomponent Density Functional Theory for Coupled Electron-Positron Dynamics.

Yasumitsu Suzuki1, Satoshi Hagiwara1, Kazuyuki Watanabe1

  • 1Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.

Physical Review Letters
|October 13, 2018
PubMed
Summary
This summary is machine-generated.

We developed a new theory for electron-positron interactions, revealing how their coupled motion affects molecular dynamics. This work clarifies positron detachment and electronic excitation under laser fields.

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Area of Science:

  • Quantum chemistry
  • Atomic and molecular physics
  • Computational physics

Background:

  • Electron-positron interactions are crucial in diverse scientific fields.
  • Understanding these dynamics requires advanced theoretical frameworks.

Purpose of the Study:

  • To develop a first-principles time-dependent multicomponent density functional theory (TD-MCDFT) for coupled electron-positron dynamics.
  • To investigate the influence of electron-positron coupling on molecular behavior under external fields.

Main Methods:

  • Formulation of coupled time-dependent single-particle equations for electron and positron dynamics.
  • Derivation of formally exact effective potentials for these coupled systems.
  • Application of the adiabatic local density approximation (ALDA) to electron-positron correlation.
  • Numerical simulation of a positronic lithium hydride molecule subjected to a laser field.

Main Results:

  • The developed TD-MCDFT accurately describes coupled electron-positron density dynamics.
  • The study reveals a complex positron detachment mechanism.
  • Electronic resonant excitation is significantly suppressed due to positron screening effects.

Conclusions:

  • The coupling between electronic and positronic motion is significant and must be considered.
  • The developed TD-MCDFT provides a powerful tool for studying electron-positron systems.
  • This research offers new insights into the behavior of exotic molecules under external stimuli.