Topological Quantum Transport Characteristic by Three-band Correlation Mechanism in 2D SnSe

Abstract

Understanding electron quantum transport and their coupling interactions in 2D matrix is crucial for manipulating and designing more efficient energy conversion devices, especially in the context of spin transport. Here, we systematically calculate the electronic dispersion properties which the synergistic interaction of the three-band accounted for the topological transport of edge correlated electrons. The helical state protected by the topology appears at the boundary, accompanied by the upward movement (∼0.2 eV) of the helical point caused by the excitation and the loop channel, which the weak braiding effect reveal local strongly correlated interactions between the boundary electrons. In addition, we also introduce spin Hall conductance and Z₂ topological invariants to describe the election dispersion of the topological transport. This provides more possibilities for the realization of topological quantum computing application.