Strain engineering of multi-interband optical transitions in beta(12)-borophene

The optical conductivity of strained monolayer /312-borophene is investigated via the Kubo formula and the five-band tight-binding method. In our model, the hopping energy of electrons is modified by strain following the Harrison rule. We investigate the effect of these modifications on the electronic dispersion and optical conductivity. Our results indicate that inherent massless Dirac fermions become massive with tensile strain and that inherent triplet fermions are doubled with compressive strain. Moreover, the strain-induced longitudinal optical conductivity was found to show a redshift spectrum with both tensile and compressive strains, while a blueshift spectrum was appeared for the transverse/Hall optical conductivity. These results show that strain can tune both electronic properties of /312-borophene and relevant practical optoelectronic applications.

Automated summary

The optical conductivity of strained monolayer /312-borophene was studied using the Kubo formula and the five-band tight-binding method. Strain-induced modifications in the hopping energy of electrons were found to affect the electronic dispersion and optical conductivity. Tensile strain caused mass generation in inherent massless Dirac fermions, while compressive strain doubled the number of inherent triplet fermions. We also observed a redshift spectrum in the strain-induced longitudinal optical conductivity, and a blueshift spectrum in the transverse/Hall optical conductivity. These findings highlight the tunability of electronic properties and optoelectronic applications of /312-borophene through strain engineering.