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

Authors

Lei Chen, Beijing University of Civil Engineering and Architecture, Peking UniversityFollow
Jack Zuber, University of WollongongFollow
Zhongshui Ma, Peking University, Collaborative Innovation Center of Quantum MatterFollow
C Zhang, University of WollongongFollow

RIS ID

137935

Publication Details

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.

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.

Grant Number

ARC/DP160101474