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Torsion effects on condensed matter: like a magnetic field but not so much

Author

Listed:
  • Anderson A. Lima

    (Departamento de Física, Universidade Federal da Paraíba
    Centro de Formação de Professores, Universidade Federal de Campina Grande)

  • Cleverson Filgueiras

    (Departamento de Física, Universidade Federal de Lavras)

  • Fernando Moraes

    (Departamento de Física, Universidade Federal da Paraíba
    Departamento de Física, Universidade Federal Rural de Pernambuco)

Abstract

In this work, we study the effects of torsion due to a uniform distribution of topological defects (screw dislocations) on free spin/carrier dynamics in elastic solids. When a particle moves in such a medium, the effect of the torsion associated to the defect distribution is analogous to that of an applied magnetic field but with subtle differences. Analogue Landau levels are present in this system but they cannot be confined to two dimensions. In the case of spinless carriers, zero modes, which do not appear in the magnetic Landau levels, show up for quantized values of the linear momentum projected on the defects axis. Particles with spin are subjected to a Zeeman-like coupling between spin and torsion, which is insensitive to charge. This suggests the possibility of spin resonance experiments without a magnetic field for charged carriers or quasiparticles without electrical charge, like triplet excitons, for instance.

Suggested Citation

  • Anderson A. Lima & Cleverson Filgueiras & Fernando Moraes, 2017. "Torsion effects on condensed matter: like a magnetic field but not so much," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(2), pages 1-8, February.
    • Handle: RePEc:spr:eurphb:v:90:y:2017:i:2:d:10.1140_epjb_e2017-70468-2
    DOI: 10.1140/epjb/e2017-70468-2
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    Solid State and Materials;

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