Pairing obstructions in topological superconductors
File(s)2001.02682.pdf (2.47 MB)
Accepted version
Author(s)
Schindler, Frank
Bradlyn, Barry
Fischer, Mark H
Neupert, Titus
Type
Journal Article
Abstract
The modern understanding of topological insulators is based on Wannier obstructions in position space. Motivated by this insight, we study topological superconductors from a position-space perspective. For a one-dimensional superconductor, we show that the wave function of an individual Cooper pair decays exponentially with separation in the trivial phase and polynomially in the topological phase. For the position-space Majorana representation, we show that the topological phase is characterized by a nonzero Majorana polarization, which captures an irremovable and quantized separation of Majorana Wannier centers from the atomic positions. We apply our results to diagnose second-order topological superconducting phases in two dimensions. Our work establishes a vantage point for the generalization of topological quantum chemistry to superconductivity.
Date Issued
2020-06-19
Date Acceptance
2020-05-11
Citation
Physical Review Letters, 2020, 124 (24)
ISSN
0031-9007
Publisher
American Physical Society
Journal / Book Title
Physical Review Letters
Volume
124
Issue
24
Copyright Statement
© 2020 American Physical Society. Schindler, F., Bradlyn, B., Fischer, M. H., & Neupert, T. (2020). Pairing obstructions in topological superconductors. Physical review letters, 124(24), 247001.
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/32639809
Publication Status
Published
Coverage Spatial
United States
Article Number
247001
Date Publish Online
2020-06-15