Terahertz Applications of Non-Simply-Connected and Helical Nanostructures

  • Thomas P. Collier
  • Vasil A. Saroka
  • Charles A. Downing
  • Arseny M. Alexeev
  • Richard R. Hartmann
  • Mikhail E. PortnoiEmail author
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)


We outline a range of proposals on using non-simply-connected and helical nanostructures for terahertz device implementations. We show that an Aharonov-Bohm quantum ring system and a double-gated quantum ring system both permit control over the polarization properties of the associated terahertz radiation. In addition, we review the superlattice properties of a nanohelix in external electric fields, which reveals negative differential conductance and photogalvanic effects. We present several schemes utilizing carbon nanotubes, including population inversion proposals for both quasi-metallic nanotubes (via generation of optically active hot electrons by an electric field), and metallic nanotubes (by optical excitation across a magnetic field-induced band gap).


Quantum rings Nanohelices Carbon nanotubes Graphene Nano-electronics Nano-electromаgnetics Terahertz range 



We would like to acknowledge financial support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC Centre for Doctoral Training in Metamaterials XM2 (Grant No. EP/L015331/1). The work was also financially supported by the EU H2020 RISE project CoExAN (Grant No. H2020-644076) and by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program.


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Thomas P. Collier
    • 1
  • Vasil A. Saroka
    • 2
  • Charles A. Downing
    • 3
  • Arseny M. Alexeev
    • 1
  • Richard R. Hartmann
    • 4
  • Mikhail E. Portnoi
    • 1
    Email author
  1. 1.School of PhysicsUniversity of ExeterExeterUK
  2. 2.Institute for Nuclear ProblemsBelarusian State UniversityMinskBelarus
  3. 3.Department of Theoretical PhysicsUniversidad Autonoma de MadridMadridSpain
  4. 4.Physics DepartmentDe La Salle UniversityManilaPhilippines

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