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Topological state engineering by potential impurities on chiral superconductors

Date Issued
2016-01-01
Author(s)
Kaladzhyan, Vardan  
Röntynen, Joel
Simon, Pascal
Ojanen, Teemu
DOI
10.1103/physrevb.94.060505
Abstract
In this work we consider the influence of potential impurities deposited on top of two-dimensional chiral superconductors. As discovered recently, magnetic impurity lattices on an s-wave superconductor may give rise to a rich topological phase diagram. We show that a similar mechanism takes place in chiral superconductors decorated by nonmagnetic impurities, thus avoiding the delicate issue of magnetic ordering of adatoms. We illustrate the method by presenting the theory of potential impurity lattices embedded on chiral p-wave superconductors. While a prerequisite for the topological state engineering is a chiral superconductor, the proposed procedure results in vistas of nontrivial descendant phases with different Chern numbers.
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