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Nonlinear optical response of the alpha-T-3 model due to the nontrivial topology of the band dispersion

Journal Article


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Abstract


  • We study the electronic contribution to the nonlinear optical response of the α-T3 model. This model is

    an interpolation between a graphene (α = 0) and dice (α = 1) lattice. Using a second-quantized formalism,

    we calculate the first- and third-order responses for a range of α and chemical potential values as well as

    considering a band gap in the first-order case. Conductivity quantization is observed for the first-order, while

    higher-order harmonic generation is observed in the third-order response with the chemical potential determining

    which applied field frequencies both quantization and harmonic generation occur at. We observe a range of

    experimentally accessible critical fields between 102–106 V/m with dynamics depending on α, μ, and the applied

    field frequency. Our results suggest an α-T3-like lattice could be an ideal candidate for use in terahertz devices.

Authors


  •   Chen, Lei (external author)
  •   Zuber, Jack (external author)
  •   Ma, Zhongshui (external author)
  •   Chao Zhang

Publication Date


  • 2019

Citation


  • Chen, L., Zuber, J., Ma, Z. & Zhang, C. (2019). Nonlinear optical response of the alpha-T-3 model due to the nontrivial topology of the band dispersion. Physical Review B, 100 (3), 035440-1-035440-16.

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4054&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3035

Start Page


  • 035440-1

End Page


  • 035440-16

Volume


  • 100

Issue


  • 3

Place Of Publication


  • United States

Abstract


  • We study the electronic contribution to the nonlinear optical response of the α-T3 model. This model is

    an interpolation between a graphene (α = 0) and dice (α = 1) lattice. Using a second-quantized formalism,

    we calculate the first- and third-order responses for a range of α and chemical potential values as well as

    considering a band gap in the first-order case. Conductivity quantization is observed for the first-order, while

    higher-order harmonic generation is observed in the third-order response with the chemical potential determining

    which applied field frequencies both quantization and harmonic generation occur at. We observe a range of

    experimentally accessible critical fields between 102–106 V/m with dynamics depending on α, μ, and the applied

    field frequency. Our results suggest an α-T3-like lattice could be an ideal candidate for use in terahertz devices.

Authors


  •   Chen, Lei (external author)
  •   Zuber, Jack (external author)
  •   Ma, Zhongshui (external author)
  •   Chao Zhang

Publication Date


  • 2019

Citation


  • Chen, L., Zuber, J., Ma, Z. & Zhang, C. (2019). Nonlinear optical response of the alpha-T-3 model due to the nontrivial topology of the band dispersion. Physical Review B, 100 (3), 035440-1-035440-16.

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4054&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3035

Start Page


  • 035440-1

End Page


  • 035440-16

Volume


  • 100

Issue


  • 3

Place Of Publication


  • United States