Perspectives on relativistic quantum chaos
Liang Huang,Ying-Cheng Lai
Figure 9. Δγ between counterclockwise and clockwise scaring states on a period-3 orbit (a) and a period-4 orbit (b). The massless Dirac regime is $m\to 0$, while $k\to 0$ is effectively $m\to \infty $ and is the Schrödinger limit. Adapted from [570] with permission.