  The minimal ingredient to generate a biaxial liquid crystalline ordering is
usually considered to be the strongly biaxial interactions breaking the
cylindrical symmetry of the uniaxial molecules. Although there is no
fundamental reason to forbid a biaxial ordering of pure uniaxial origin, it has
been a long standing problem to find a robust demonstration of such phenomenon
in systems of rod-like particles. We report here off-lattice Monte Carlo
simulations of some new model systems of polar achiral rodlike ellipsoids which
spontaneously exhibit novel biaxial smectic phases of pure uniaxial origin. We
show that dipolar interactions can generate different biaxial phases of pure
uniaxial origin in systems of cylindrically symmetric Gay-Berne ellipsoids for
an wide variety of length-to-width ratios. The systems of ellipsoids with low
length-to-width ratios exhibit highly tilted biaxial smectic phases in the
presence of central axial dipoles. In case of ellipsoids having high
length-to-width ratio, the generation of a biaxial phase requires the presence
of two parallel axial terminal dipoles. In addition, the phases also exhibit
fascinating ferroelectric or striped ordering of the dipolar ellipsoids.
