Gate-Driven Pure Spin Current in Graphene

Manipulating spin current rather than electric current is considered a promising route to ultralow-power ``beyond CMOS'' devices. The authors propose a graphene-based demultiplexer that enables voltage-controlled distribution and propagation of pure spin current. Gate-driven pure spin current would allow multiple logic functions to be cascaded without spin-charge conversion, for efficient long-distance transport, so this device could be a building block for reconfigurable spin-logic circuits.