For 10 points, name this effect in which the application of an external magnetic field to a current-carrying conductor results in the generation of a voltage gradient.
In 2005, Rikken, Strohm and Wyder observed this effect in phonons, proving its existence for uncharged particles. This effect can be quantified via the van der Pauw technique, and the mechanism behind it is the Lorenz force. The "quantum" version of this effect is quantized in multiples of Planck's constant over the square of the charge on an electron. For 10 points, name this effect in which the application of an external magnetic field to a current-carrying conductor results in the generation of a voltage gradient.
In 2005, Rikken, Strohm and Wyder observed this effect in phonons, proving its existence for uncharged particles.
Hall effect