  The simultaneous effect of intense THz laser and in-plane electric fields on
Aharonov-Bohm effect in single isotropic quantum rings is investigated using
the non-perturbative Floquet theory in high-frequency limit. It is shown that
in isotropic quantum rings the intense THz laser and in-plane electric field
create unusual Aharonov-Bohm oscillations. For fixed values of intense THz
laser field parameter, the amplitudes of Aharonov-Bohm oscillations can be
effectively tuned by changing the electric field direction. Furthermore, for
fixed values of electric field strength and laser field parameter the intraband
optical properties can be effectively tuned by changing the electric field
direction. Thus, it can be argued that a circular QR in the intense THz laser
field is equivalent to the anisotropic quantum ring, and the electric field
direction effectively tunes the unusual Aharonov-Bohm oscillations and
intraband optical properties of the ring.

Mesoscale and Nanoscale Physics