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Four-terminal Hall bar configuration. (a) The gate is isolated from the bar and it is patterned between two voltage probes, denoted by source and drain . Resistances between the voltage probes and bar ends are denoted by and . (b) A two-input logic gate is obtained by replacing the voltage source with two digital voltage inputs and and series resistors .
Measured longitudinal voltage on a Hall bar as a function of the bias at gate potential . Operating points which correspond to different logic functions are marked by symbols. XOR gate (circles) is obtained for and , NAND gate (squares) for and , NOR gate (triangles) for and , and NOT gate (rhombuses) for and . Inset: truth table of all presented gates. Logic levels and correspond to digital inputs shown in Fig. 1(b) .
Digital wave forms measured on a Hall bar with input voltage levels chosen as in Fig. 2 .
Output voltage of the NOT gate at input frequencies of , , and .
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