GIANT-DIPOLE EFFECT AND 2ND-HARMONIC GENERATION IN QUANTUM WIRES BIASED WITH A MAGNETIC-FIELD

We have theoretically studied giant dipoles associated with transition s between magneto-electric subbands in a quantum wire subjected to a t ransverse magnetic field. The strengths of these dipoles and their res onant frequencies can be varied with the magnetic field which then all ows one to tune the emission wavelength of these transitions. The larg e magnitude of the dipole moments also leads to a strong second-harmon ic component of the dielectric susceptibility that can be utilized for nonlinear optical applications such as second-harmonic generation, li miting, mixing, optical switching, etc. (C) 1997 American Institute of Physics.