Re-parameterization Invariance in Fractional Flux Periodicity
  We analyze a common feature of a nontrivial fractional flux periodicity in two-dimensional systems. We demonstrate that an addition of fractional flux can be absorbed into re-parameterization of quantum numbers. For an exact fractional periodicity, all the electronic states undergo the re-parameterization, whereas for an approximate periodicity valid in a large system, only the states near the Fermi level are involved in the re-parameterization. 
Shuichi Murakami, Ken-ichi Sasaki, Riichiro Saito