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The Nonlinear Optical Response of the \alpha-TLattice in the Terahertz Regime

Conference Paper


Abstract


  • We study the electronic contribution to the nonlinear optical response of the \alpha-T model. This model is an interpolation between a graphene (\alpha=0) and dice or T (\alpha=1) lattice (Fig. 1.). Using a second-quantised formalism we calculate the first and third order responses for a range of \alpha and chemical potential values as well as considering a band gap in the first-order case. Conductivity quantisation is observed in the first order, whilst Higher-order Harmonic Generation (HHG) is observed in the third order response with the chemical potential (\mu) determining which applied field frequencies both quantisation and HHG occur at. We observe a range of experimentally accessible critical fields between 10-106 V/m with dynamics depending on \alpha,\ \mu and applied field frequency. Our results suggest an \alpha-T could be an ideal candidate material for use in tunable terahertz devices.

Publication Date


  • 2020

Citation


  • Zuber, J., & Zhang, C. (2020). The Nonlinear Optical Response of the \alpha-TLattice in the Terahertz Regime. In International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz Vol. 2020-November (pp. 892). doi:10.1109/IRMMW-THz46771.2020.9370855

Scopus Eid


  • 2-s2.0-85103203264

Web Of Science Accession Number


Start Page


  • 892

Volume


  • 2020-November

Abstract


  • We study the electronic contribution to the nonlinear optical response of the \alpha-T model. This model is an interpolation between a graphene (\alpha=0) and dice or T (\alpha=1) lattice (Fig. 1.). Using a second-quantised formalism we calculate the first and third order responses for a range of \alpha and chemical potential values as well as considering a band gap in the first-order case. Conductivity quantisation is observed in the first order, whilst Higher-order Harmonic Generation (HHG) is observed in the third order response with the chemical potential (\mu) determining which applied field frequencies both quantisation and HHG occur at. We observe a range of experimentally accessible critical fields between 10-106 V/m with dynamics depending on \alpha,\ \mu and applied field frequency. Our results suggest an \alpha-T could be an ideal candidate material for use in tunable terahertz devices.

Publication Date


  • 2020

Citation


  • Zuber, J., & Zhang, C. (2020). The Nonlinear Optical Response of the \alpha-TLattice in the Terahertz Regime. In International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz Vol. 2020-November (pp. 892). doi:10.1109/IRMMW-THz46771.2020.9370855

Scopus Eid


  • 2-s2.0-85103203264

Web Of Science Accession Number


Start Page


  • 892

Volume


  • 2020-November