Relativistic Fermion on a Ring: Energy Spectrum and Persistent Current
Figure 7
Nature of susceptibility for a ring with radius at different masses which are written on the top of every plot. We have used the same units as Figure 2 in which the unit of susceptibility is . For large mass, susceptibility is negative (a) and almost constant. It shows periodic oscillation with a negative amplitude ((b) and (c)) for and becomes zero at critical mass (d). For lower mass, it again shows oscillation ((e) and (f)) but with positive amplitude. The blue and red dashed lines correspond to even and odd number of electrons which overlaps with each other.
