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So a topological insulator can induce a magnetic field when an electric charge is near to it (I can give a reference if necessary), but the thing is, the paper interprets the origin of this magnetic field as being the hall currents on the surface of the topological insulator.

Now I don't see the connection between hall currents and topological insulators? Is it obvious that there should be a thing as a hall current on the surface? Or is it only understandable through teneous quantum mechanical calculations relying on spin-orbit coupling?

Note that I know a little about what quantum hall effect and quantum spin hall effect have to do with topological insulators (the latterbeinga topological insulator), but in each of these cases, it didn't come across to me that the hall current was playing a role in the story. So maybe I'm overlooking something at that basic level. The easiest "solution" would be "the edge current on the boundar of a quantum hall effect state and e.g. vacuum is a hall current", but I don't think that is true.

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# What do topological insulators have to do with hall currents?

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