## K-theoretic Gap labeling for Quasicrystals

by
Fonger Ypma

Venue: | CONTEMPORARY MATHEMATICS |

### BibTeX

@MISC{Ypma_k-theoreticgap,

author = {Fonger Ypma},

title = { K-theoretic Gap labeling for Quasicrystals},

year = {}

}

### OpenURL

### Abstract

We will review the use of noncommutative topology in the generalisation of Bloch theory from crystals to quasicrystals. After introducing Bloch theory, we will construct the noncommutative space of tilings and we will argue that this is the noncommutative analogue of the Brillouin zone which is used in Bloch theory. The K-theory of the noncommutative Brillouin zone will be used to provide a labeling of the gaps in the spectrum of quasiperiodic Hamiltonians, which can be seen as first step towards a generalisation of Bloch theory to quasicrystals.