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We show that high-harmonic generation (HHG) in carbon nanotubes (CNTs) can beefficiently controlled using the Aharanov-Bohm (AB) effect. When a staticmagnetic field (B) is applied along the tube, electronic wave functions acquirecomplex phases along the circumferential direction (AB effect), which modifiesthe band structure. In particular, when the magnetic field is applied tometallic CNTs, which can be regarded as one-dimensional massless Dirac systems,realistic values of B lead to a nonzero gap in the THz regime. We demonstratethat such change from gapless to gapped Dirac systems drastically increases theHHG intensity in the THz regime. In the gapless Dirac system, the velocity ofeach electron never changes under the electric field, and thus there is no HHG.On the other hand, the gap opening activates both the interband and itrabandcurrents, which strongly contribute to HHG. Our work demonstrates a unique wayto manipulate HHG in nanotubes by tuning electronic wave functions using themagnetic field and the tube structure.

Efficient Control of High Harmonic Generation in Carbon Nanotubes using the Aharonov-Bohm Effect