Non-trivial Berry phase for an asymmetric one-dimensional potential in the free electron limit
Department of Physics, Davidson College, Davidson, 28035
2 Department of Chemistry & Physics, Western Carolina University, Cullowhee, 28723 NC, USA
a e-mail: email@example.com
Received in final form: 7 October 2011
Published online: 21 November 2011
We find a non-trivial Berry phase for a finite potential, even in the delocalized-electron limit. We obtain this result for a one-dimensional, periodic sawtooth potential, though our analysis is applicable to other systems. We show that this result is due to both the periodicity of the time-independent wave function and the effects of interband degeneracies. We also find, for the sawtooth potential, that each band is uniquely characterized by its Berry phase’s functional dependence on the potential’s parameters. Thus, each band may be identified by the behavior of its Berry phase.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011