Non-local order parameters for fermion chains via the partial transpose

• URL: http://arxiv.org/abs/2206.03260v2
• Date: Mon, 2 Jan 2023 18:40:02 GMT
• Title: Non-local order parameters for fermion chains via the partial transpose
• Authors: Lorenz P. Mayer
• Abstract summary: This paper takes up proposals for non-local order parameters defined through anti-unitary symmetries. For matrix product states, an interpretation of these invariants is provided.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In the last two decades, a vast variety of topological phases have been described, predicted, classified, proposed, and measured. While there is a certain unity in method and philosophy, the phenomenology differs wildly. This work deals with the simplest such case: fermions in one spatial dimension, in the presence of a symmetry group $G$ which contains anti-unitary symmetries. A complete classification of topological phases, in this case, is available. Nevertheless, these methods are to some extent lacking as they generally do not allow to determine the class of a given system easily. This paper will take up proposals for non-local order parameters defined through anti-unitary symmetries. They are shown to be homotopy invariants on a suitable set of ground states. For matrix product states, an interpretation of these invariants is provided: in particular, for a particle-hole symmetry, the invariant determines a real division super algebra $\mathbb{D}$ such that the bond algebra is a matrix algebra over $\mathbb{D}$.

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