1201.6142 (Miloslav Znojil et al.)

Schroedinger equations with indefinite effective mass    [PDF]

Miloslav Znojil, Géza Lévai

The consistency of the concept of quantum (quasi)particles possessing
effective mass which is both position- and excitation-dependent is analyzed via
simplified models. It is shown that the system may be stable even when the
effective mass m=m(x,E) itself acquires negative values in a limited range of
coordinates x and energies E.

View original: http://arxiv.org/abs/1201.6142