Spin Transport and Spin Pump in Graphene-like Materials: Effect of tilt in Dirac cones

Abstract

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.

comments are welcome

References in corpus (18)

• Spin Seebeck insulator
• Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
• Simulation and detection of Dirac fermions with cold atoms in an optical lattice
• Electronic properties of 8-Pmmn borophene
• Strain-induced pseudomagnetic field in Dirac semimetal borophene
• Controllable spin transport in ferromagnetic graphene junctions
• Quantum transport in Dirac materials: signatures of tilted and anisotropic Dirac and Weyl cones
• Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
• Spin-valley filtering in strained graphene structures with artificially induced carrier mass and spin-orbit coupling
• Effect of electron-hole asymmetry on optical conductivity in 8-Pmmn borophene
• Klein tunneling and electron optics in Dirac-Weyl fermion systems with tilted energy dispersion
• Current-Voltage Characteristics of Weyl Semimetal Semiconducting Devices, Veselago Lenses and Hyperbolic Dirac Phase
• Tunable Anomalous Andreev Reflection and Triplet Pairings in Spin Orbit Coupled Graphene
• Double Andreev Reflections in Type-II Weyl Semimetal-Superconductor Junctions
• Magnetoplasmons of the tilted-anisotropic Dirac cone material $\alpha -$(BEDT-TTF)${}_2$I${}_3$
• Tunable Supercurrent at the Charge Neutrality Point via Strained Graphene Junctions
• Spin pumping into two-dimensional electron systems
• Andreev tunnelling and Josephson current in light irradiated graphene

Cited by in corpus (5)

• Synthetic non-Abelian gauge fields and gravitomagnetic effects in tilted Dirac cone systems
• Josephson effect in type-I Weyl Semimetals
• Perpendicular Andreev reflection: Solid state signature of black hole horizon
• Mapping borophene onto graphene: Quasi-exact solutions for guiding potentials in tilted Dirac cones
• Quantum anomaly and anomalous Josephson effect in inversion asymmetric Weyl semimetals