In a nonlinear Hall effect (NLHE), an electric field applied in the plane of a material induces a transverse voltage that depends nonlinearly on the field. This voltage can scale with either an odd or an even power of the electric field, but the conditions governing these two types of responses have been poorly understood until now. Luojun Du of the Chinese Academy of Sciences and his colleagues have demonstrated and explored such odd- and even-order NLHEs in a bilayer-graphene system [1]. Their findings could help scientists develop more efficient rectifiers and other electronic devices.
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