@Blue keep in mind that most
useful treatments of Landau quantization tend to be geared towards the solid state, and the 'particles' you're quantizing are really
quasiparticles, i.e. joint excitations on the states of many particles, which then act like a single-particle system. The interesting bit isn't increasing in size, but in increasing complexity of the particle, i.e. pushing towards skyrmions and whatnot.