The diode effects in a polar superconductor depends on a relative orientation of applied current (l), magnetic field (B), and polar axis (r), and thus, can be switched by reversing the direction ...

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.