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Ab initio non-relativistic spin dynamics.

Feizhi Ding1, Joshua J Goings1, Michael J Frisch2

  • 1Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.

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|December 8, 2014
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Summary
This summary is machine-generated.

This study introduces a new method for describing magnetic materials with complex spin alignments. The time-dependent non-relativistic two-component spinor (TDN2C) approach enables first-principles simulations of spin dynamics.

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Area of Science:

  • Computational Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • Standard electronic structure methods struggle with magnetic materials lacking collinear spin alignment.
  • Existing methods often require electron spins to align to a global magnetization axis, limiting their applicability.
  • Describing noncollinear electron spin dynamics is crucial for understanding complex magnetic phenomena.

Purpose of the Study:

  • To develop a generalized electronic structure method capable of handling noncollinear electron spins.
  • To enable first-principles, time-domain simulations of spin dynamics in magnetic materials.
  • To investigate the response of electronic spin to external magnetic fields.

Main Methods:

  • Development of an ab initio time-dependent non-relativistic two-component spinor (TDN2C) method.
  • Generalization of time-dependent Hartree-Fock equations to incorporate free electron spin rotation.
  • Implementation of a numerical tool using Hirshfeld partitioning for spin magnetization analysis.
  • Inclusion of electron spin coupling with homogeneous magnetic fields.

Main Results:

  • The TDN2C method successfully describes spin dynamics in the time domain from first principles.
  • Numerical simulations accurately reproduced analytic results for Larmor precession in hydrogen and lithium atoms.
  • The method was validated on model systems, including the spin-frustrated Li3 molecule.

Conclusions:

  • The TDN2C method overcomes limitations of traditional electronic structure approaches for noncollinear magnetism.
  • This work provides a powerful tool for simulating and understanding complex spin behaviors.
  • The TDN2C approach opens new avenues for ab initio studies in molecular spin transport and spintronics.