In comparison, the diode behaviour in single molecules has ... be able to determine and control the orientation of the molecule relative to the polarity of the applied bias voltage.

(Source: Virginia Polytechnic Institute) The heat-transfer ratio of this thermal diode is fairly independent of orientation, making it suitable for applications including space-related cooling.

A superconducting diode effect was observed in an Fe(Se,Te)/FeTe heterostructure, enabling current to preferentially flow in one direction under varying temperatures and magnetic fields.