Terahertz Applications of Non-Simply-Connected and Helical Nanostructures
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).
KeywordsQuantum 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.
- 14.(2018) Physics of quantum rings (2nd ed). Nanoscience and technology, by V. Fomin. Springer, ChamGoogle Scholar
- 21.Physical properties of carbon nanotubes, by R. Saito, G. Dresselhaus, M. S. Dresselhaus (Imperial College Press, London, 1998)Google Scholar
- 24.Shahnazaryan V, Saroka VA, Shelykh IA, Portnoi ME (2017) arXiv 1710:02764 Google Scholar