The massless 2D case can be simulated in single-layer materials like graphene near the Dirac cones, where the eigenergies are given by E g r a p h e n e = ± ± 2 ν ν ℏ ℏ e B v F 2 where the speed of light has to be replaced with the Fermi speed v F of the material and the minus sign corresponds to electron holes.