Coherent spin transport through helical edge states of topological insulator

摘要: We study coherent spin transport through helical edge states of topological insulator tunnel-coupled to metallic leads. demonstrate that unpolarized incoming electron beam acquires finite polarization after transmission such a setup provided edges contain at least one magnetic impurity. The appears even in the fully classical regime and is therefore robust dephasing. There also quantum field-tunable contribution polarization, which shows sharp identical Aharonov-Bohm resonances as function flux—with period hc/2e—and survives relatively high temperature. this tunneling interferometer can be described terms ensemble flux-tunable qubits giving equal contributions conductance polarization. number active participating charge given by ratio temperature level spacing. effectively operate used for calculations. In particular, single Hadamard operator. obtained results open wide avenue applications area computing.