Abstract
We introduce a class of superconductors (SCs) in two spatial dimensions with time-reversal symmetry and reflection (i.e., mirror) symmetry. In the absence of interactions, topological classes of these SCs are distinguished by an integer-valued () topological invariant. When interactions are included, we show that the topological classification is modified to . This clearly demonstrates that interactions can have a qualitative effect on topological classifications of gapped states of matter in more than one dimension.
- Received 1 June 2013
DOI:https://doi.org/10.1103/PhysRevB.88.064507
©2013 American Physical Society