# SciPost Commentary Page

### Original publication:

Title: | Topological order in the Kitaev/Majorana chain in the presence of disorder and interactions |

Author(s): | Niklas M. Gergs, Lars Fritz, Dirk Schuricht |

As Contributors: | Dirk Schuricht |

Journal ref.: | Physical Review B 93, 075129 |

DOI: | http://doi.org/10.1103/PhysRevB.93.075129 |

Date: | 2016-02-16 |

### Abstract:

We study the combined effect of interactions and disorder on topological order in one dimension. Toward that end, we consider a generalized Kitaev chain including fermion-fermion interactions and disorder in the chemical potential. We determine the phase diagram by performing density-matrix renormalization-group calculations on the corresponding spin-1/2 chain. We find that moderate disorder or repulsive interactions individually stabilize the topological order, which remains valid for their combined effect. However, both repulsive and attractive interactions lead to a suppression of the topological phase at strong disorder.

There is a misprint in Eq. (6), namely a minus sign in the element in the upper right is missing. The entry has to read $-\frac{t-\Delta}{t+\Delta}$. The results shown in Fig. 1 were obtained with the correct sign.