Majorana zero energy modes in silicene (1801.02900v1)

Abstract: Zero energy modes are shown to exist in silicene under suitably chosen magnetic as well as electric fields. Two Majorana modes are found on the application of opposite local magnetization on the silicene sub-lattices. We identify a non-Majorana zero energy mode carrying pure spin current under the influence of inhomogeneous gate electric field. In both cases, wave functions reveal subtle interference pattern in phase space, showing structures finer than the Planck constant $\hbar$. A spin system coupled through spin-spin ($\sigma_{z}\otimes\sigma_{z}$) interaction with the Majorana modes exhibits periodic revival of coherence with a minimum period $\sim $1/n. The same system shows decoherence-free evolution in the case of gate electric field. Under a momentum dependent interaction, one Majorana mode having a bound state in the continuum character is found to be more robust as compared to the other. The mode arising on application of electric field shows rapid loss of coherence for such an interaction.