"Heavy fermions" in a supersymmetric ferroelectric domain wall
Volkov B. A., Pankratov O. A.
The interface between domains in a ferroelectric compound A 4B 6 has two-dimensional electronic states, whose energy is independent of the quasimomentum. These states are nonetheless quantized in a magnetic field. As a result, the surface density of these states oscillates as a function of the field.