Positive and negative effective mass of classical particles in oscillatory and static fields

I. Y. Dodin, N. J. Fisch

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

A classical particle oscillating in an arbitrary high-frequency or static field effectively exhibits a modified rest mass meff derived from the particle averaged Lagrangian. Relativistic ponderomotive and diamagnetic forces, as well as magnetic drifts, are obtained from the meff dependence on the guiding center location and velocity. The effective mass is not necessarily positive and can result in backward acceleration when an additional perturbation force is applied. As an example, adiabatic dynamics with m >0 and m <0 is demonstrated for a wave-driven particle along a dc magnetic field, m being the effective longitudinal mass derived from meff. Multiple energy states are realized in this case, yielding up to three branches of m for a given magnetic moment and parallel velocity.

Original languageEnglish (US)
Article number036402
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume77
Issue number3
DOIs
StatePublished - Mar 7 2008

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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