Elastic phonon dephasing effect on spin transport in 2D hexagonal lattice topological insulator

Abstract

2D hexagonal lattice Topological Insulator(TI) shows topologically protectedspin polarized edge transport while the bulk of the material remains insulating.Thesuppressionofbackscatteringofelectronsmakestheedgetransportofelec-trons robust against any perturbation. Elastic phonon dephasing represents ageneralized scattering and dephasing mechanism. In this work, we have illus-trated the effect of elastic phonon dephasing on the transport of electron in 2Dhexagonal lattice TI using Non Equilibrium Green’s Function (NEGF) formal-ism.Thetransmissionwasfoundtobeunity(1)andthephaseoftheelectronre-mained coherent even after strong phonon dephasing. The results of this paperindicate the suitability of TI in future dissipationless coherent nanoelectronicdevices.