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The Datta-Das-type spin field-effect transistor, using a two-dimensionalelectron gas in a semiconductor heterostructure as a channel, plays a key rolein spintronics. Here, we theoretically present a type of spin field-effecttransistor based on massless birefringent Dirac fermions in polar Diracsemimetals. The manipulation of spin arises from the existence of the strongspin-orbit coupling, polar space groups, and Dirac cones in a single phase. Theoscillatory channel conductance can be controlled by the sign of gate voltagein addition to its magnitude due to the gapless band structures of polar Diracsemimetals. Such spin field-effect transistor provides guidance for the furtherdesign of spintronic devices.

Spin field-effect transistors based on massless birefringent Dirac fermions in polar Dirac semimetals