Low-Offset Graphene Hall Sensor

摘要

A Graphene Hall sensor (GHS) may be provided with a modulated gate bias signal in which the modulated gate bias signal alternates at a modulation frequency between a first voltage that produces a first conductivity state in the GHS and a second voltage that produces approximately a same second conductivity state in the GHS. A bias current may be provided through a first axis of the GHS. A resultant output voltage signal may be provided across a second axis of the Hall sensor that includes a modulated Hall voltage and an offset voltage, in which the Hall voltage is modulated at the modulation frequency. An amplitude of the Hall voltage that does not include the offset voltage may be extracted from the resultant output voltage signal.

主权项

1. A method for operating a graphene Hall sensor, the method comprising:
providing a modulated gate bias signal to a gate of the Graphene Hall sensor (GHS), in which the modulated gate bias signal alternates at a modulation frequency between a first voltage that produces a first conductivity state in the GHS and a second voltage that produces approximately a same second conductivity state in the GHS; providing a bias current through a first axis of the GHS; obtaining a resultant output voltage signal across a second axis of the Hall sensor that includes a modulated Hall voltage and an offset voltage, in which the Hall voltage is modulated at the modulation frequency; and extracting an amplitude of the Hall voltage that does not include the offset voltage.