CPT-conserved effective mass Hamiltonians through first and higher order   charge operator C in a supersymmetric framework
  This paper examines the features of a generalized position-dependent mass Hamiltonian in a supersymmetric framework in which the constraints of pseudo-Hermiticity and CPT are naturally embedded. Different representations of the charge operator are considered that lead to new mass-deformed superpotentials which are inherently PT-symmetric. The qualitative spectral behavior of the Hamiltonian is studied and several interesting consequences are noted. 
B. Bagchi, A. Banerjee and A. Ganguly
quant-ph hep-th math-ph math.MP