  Polymorph of 8-Pmmn borophene exhibits anisotropic tilted Dirac cones. In
this work, we explore the consequences of the tilted Dirac cones in
magnetotransport properties of a periodically modulated borophene. We evaluate
modulation induced diffusive conductivity by using linear response theory in
low temperature regime. The application of weak modulation (electric/magnetic
or both) gives rise to the magnetic field dependent non-zero oscillatory drift
velocity which causes Weiss oscillation in the longitudinal conductivity at low
magnetic field. The Weiss oscillation is studied in presence of an weak spatial
electric, magnetic and both modulations individually. The tilting of the Dirac
cones gives rise to additional contribution to the Weiss oscillation in
longitudinal conductivity. Moreover, it also enhances the frequency of the
Weiss oscillation and modifies its amplitude too. Most remarkably, It is found
that the presence of out-of phase both i.e., electric and magnetic modulations
can cause a sizable valley polarization in diffusive conductivity. The origin
of valley polarization lies in the opposite tilting of the two Dirac cones at
two valleys.
