Harmonic generation in bent graphene with artificially enhanced spin-orbit coupling

Abstract

<p>We theoretically investigate the nonlinear response of bent graphene in the presence of artificially enhanced spin-orbit coupling, which can occur either via adatom deposition or by placing the sheet of bent graphene in contact with a spin-orbit-active substrate. We discuss the interplay between the spin-orbit coupling and the artificial magnetic field generated by the bending for the cases of both Rashba and intrinsic spin-orbit coupling. For the latter, we introduce a spin-field interaction Hamiltonian addressing directly the electron spin as a degree of freedom. Our findings reveal that in this case, by controlling the amount of spin-orbit coupling, it is possible to significantly tune the spectrum of the nonlinear signal, achieving, in principle, efficient conversion of light from the terahertz to UV region.</p>