Local topological phase transitions in periodic condensed matter systems

Details Local topological phase transitions in periodic condensed matter systems Local topological phase transitions in periodic condensed matter systems

2011-02-16

arxiv.org/abs/1102.3282v3

Eur. Phys. J. B 85 (3) 94 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1140/epjb/e2012-21057-8

Topological properties of a periodic condensed matter system are global features of its Brillouin zone (BZ). In contrast, the validity of effective low energy theories is usually limited to the vicinity of a high symmetry point in the BZ. We derive a general criterion under which the control parameter of a topological phase transition localizes the topological defect in an arbitrarily small neighbourhood of a single point in $k$-space upon approaching its critical value. Such a local phase transition is associated with a Dirac-like gap closing point, whereas a flat band transition is not localized in $k$-space. This mechanism and its limitations are illustrated with the help of experimentally relevant examples such as HgTe/CdTe quantum wells and bilayer graphene nanostructures.

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