There exist multiple branch points in the energy spectrum for some PT -symmetric periodic potentials, where the real eigenvalues turn into complex ones. By studying the transmission amplitude for a localized complex potential, we elucidate the physical origin of the breakdown of the perturbation method and Born approximation. Most importantly, we derive an analytic criterion to determine why, when, and where the bifurcation will occur.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 2009 Oct 6|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics