High Harmonic Generation In Single-Walled Carbon Nanotubes Driven By A Circularly Polarized Incident Field*

High-order harmonic generation occurs in single-walled carbon nanotubes when a time-periodic field is applied at a large enough intensity to induce significant nonlinearities in the electron current. Regularized delta-function potentials were used to approximate the energy band structure of graphene and nanotubes. Then 10-10 armchair nanotubes were modeled using Floquet-Bloch theory driven by a circularly polarized field propagating parallel to the tube axis. Quasienergy, average energy, and electron current are computed, and the nature of the high harmonic emission spectrum will be discussed.