We study the spin transport phenomena in two-dimensional graphene-like
materials with arbitrary tilted Dirac cones. The tilt arises due to
next-nearest hopping when the bottom of the conduction band and top of the
valence band does not simultaneously coincide at Dirac point. We consider
normal-ferromagnetic-normal (N-F-N) junction of the materials and using the
generalized scattering approach calculate the spin current. Here, we show that
tilting the Dirac cones can strongly change the transport properties by
modifying the period of oscillation of the spin current. The spin conductance
can be effectively tuned by the tilt with taking advantage of the modified
interference condition. A pure spin current reversal also possible with a
smooth variation of the tilting. We further study the spin current by the
adiabatic precession of a doped ferromagnet on top of the material. It is shown
that the spin-mixing conductance and hence the spin current can become zero by
turning the tilt of the Dirac cone. Our findings provide an efficient way
towards high controllability of spin transport by tuning the tilt of the
ferromagnetic junction and can be very useful in the field of spintronics. The
model also presents a simplified way to measure the tilt of Dirac cone of those
materials.Comment: comments are welcom
